diff --git a/src/pages/authentication/BusRegister.js b/src/pages/authentication/BusRegister.js
index e224cb0..ad248a5 100644
--- a/src/pages/authentication/BusRegister.js
+++ b/src/pages/authentication/BusRegister.js
@@ -10,7 +10,7 @@ import {
   Stack,
   Typography,
   Button, StepLabel,
-
+  CircularProgress,
 } from '@mui/material';
 import VisibilityIcon from '@mui/icons-material/Visibility';
 
@@ -32,9 +32,11 @@ const BusRegister = () => {
   const [completed, setCompleted] = useState([false]);
   const [updateValid, setUpdateValid] = useState(false);
   const step0GuardRef = useRef(null);
+  const nextBusyRef = useRef(false);
   const [username, setUsername] = useState("")
   const [base64Url, setBase64Url] = useState("")
   const [checkCode, setCheckCode] = useState("")
+  const [isNextBusy, setIsNextBusy] = useState(false);
   const intl = useIntl();
   const steps = [
     intl.formatMessage({id: 'personalInformation'}),
@@ -98,30 +100,38 @@ const BusRegister = () => {
   }
 
   const handleNext = async () => {
-    if (activeStep === 0 && step0GuardRef.current) {
-      const step0Ok = await Promise.resolve(step0GuardRef.current());
-      if (!step0Ok) {
+    if (nextBusyRef.current) return;
+    nextBusyRef.current = true;
+    setIsNextBusy(true);
+    try {
+      if (activeStep === 0 && step0GuardRef.current) {
+        const step0Ok = await Promise.resolve(step0GuardRef.current());
+        if (!step0Ok) {
+          return;
+        }
+      }
+      const captchaTest = await handleCaptcha();
+      if (!captchaTest) {
+        notifyActionError(intl.formatMessage({id: 'validVerify'}))
         return;
       }
-    }
-    const captchaTest = await handleCaptcha();
-    if (!captchaTest) {
-      notifyActionError(intl.formatMessage({id: 'validVerify'}))
-      return;
-    }
 
-    const test = await handleCheckUsername()
-    if (test) {
-      notifyActionError(intl.formatMessage({id: 'usernameTaken'}))
-    } else {
-      const newActiveStep =
-        isLastStep() && !allStepsCompleted()
-          ? // It's the last step, but not all steps have been completed,
-          // find the first step that has been completed
-          steps.findIndex((step, i) => !(i in completed))
-          : activeStep + 1;
-      setActiveStep(newActiveStep);
-      scrollToTop();
+      const test = await handleCheckUsername()
+      if (test) {
+        notifyActionError(intl.formatMessage({id: 'usernameTaken'}))
+      } else {
+        const newActiveStep =
+          isLastStep() && !allStepsCompleted()
+            ? // It's the last step, but not all steps have been completed,
+            // find the first step that has been completed
+            steps.findIndex((step, i) => !(i in completed))
+            : activeStep + 1;
+        setActiveStep(newActiveStep);
+        scrollToTop();
+      }
+    } finally {
+      nextBusyRef.current = false;
+      setIsNextBusy(false);
     }
   };
 
@@ -224,7 +234,7 @@ const BusRegister = () => {
             ) : (
               <Button
                 color="inherit"
-                disabled={activeStep === 0}
+                disabled={activeStep === 0 || isNextBusy}
                 onClick={handleBack}
                 sx={{ mr: 1 }}
                 variant="h5"
@@ -238,10 +248,20 @@ const BusRegister = () => {
             <Stack sx={{ flex: '1 1 auto' }} />
             {activeStep === totalSteps() - 2 ?
               (
-                <Button variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
-                  <Typography variant="h5">
-                    <FormattedMessage id="submit"/>
-                  </Typography>
+                <Button
+                  variant="outlined"
+                  disabled={isNextBusy}
+                  onClick={handleNext}
+                  aria-busy={isNextBusy}
+                  sx={{ mr: 1, minWidth: 120 }}
+                >
+                  {isNextBusy ? (
+                    <CircularProgress size={22} color="inherit" aria-hidden />
+                  ) : (
+                    <Typography variant="h5">
+                      <FormattedMessage id="submit"/>
+                    </Typography>
+                  )}
                 </Button>
               ) : (activeStep === totalSteps() - 1 ?
                 (
@@ -254,7 +274,7 @@ const BusRegister = () => {
                 ) :
                 (
                   // <Button disabled={updateValid} variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
-                  <Button disabled={!updateValid} variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
+                  <Button disabled={!updateValid || isNextBusy} variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
                     <Typography variant="h5">
                       <FormattedMessage id="continue"/>
                     </Typography>
diff --git a/src/pages/authentication/IAmSmartRegister.js b/src/pages/authentication/IAmSmartRegister.js
index 2da4f16..a40864d 100644
--- a/src/pages/authentication/IAmSmartRegister.js
+++ b/src/pages/authentication/IAmSmartRegister.js
@@ -13,6 +13,7 @@ import {
   Stack,
   Typography,
   Button,
+  CircularProgress,
 } from '@mui/material';
 import VisibilityIcon from '@mui/icons-material/Visibility';
 import { GET_ID, POST_VERIFY_CAPTCHA } from "utils/ApiPathConst";
@@ -55,9 +56,11 @@ const Register = () => {
   const [completed, setCompleted] = useState([false]);
   const [updateValid, setUpdateValid] = useState(false);
   const step0GuardRef = useRef(null);
+  const nextBusyRef = useRef(false);
   const [base64Url, setBase64Url] = useState("")
   const [checkCode, setCheckCode] = useState("")
   const [idNo, setIdNo] = useState("");
+  const [isNextBusy, setIsNextBusy] = useState(false);
   const intl = useIntl();
   const steps = [
     intl.formatMessage({id: 'personalInformation'}),
@@ -103,29 +106,37 @@ const Register = () => {
       notifyActionError(intl.formatMessage({id: 'iAmSmartNoIdNoMsg'}))
       return;
     }
-    if (activeStep === 0 && step0GuardRef.current) {
-      const step0Ok = await Promise.resolve(step0GuardRef.current());
-      if (!step0Ok) {
+    if (nextBusyRef.current) return;
+    nextBusyRef.current = true;
+    setIsNextBusy(true);
+    try {
+      if (activeStep === 0 && step0GuardRef.current) {
+        const step0Ok = await Promise.resolve(step0GuardRef.current());
+        if (!step0Ok) {
+          return;
+        }
+      }
+      const captchaTest = await handleCaptcha();
+      if (!captchaTest) {
+        notifyActionError(intl.formatMessage({id: 'validVerify'}))
         return;
       }
-    }
-    const captchaTest = await handleCaptcha();
-    if (!captchaTest) {
-      notifyActionError(intl.formatMessage({id: 'validVerify'}))
-      return;
-    }
-    const test = await handleCheckID()
-    if (test) {
-      notifyActionError(intl.formatMessage({id: 'userRegistered'}))
-    } else {
-      const newActiveStep =
-        isLastStep() && !allStepsCompleted()
-          ? // It's the last step, but not all steps have been completed,
-          // find the first step that has been completed
-          steps.findIndex((step, i) => !(i in completed))
-          : activeStep + 1;
-      setActiveStep(newActiveStep);
-      scrollToTop();
+      const test = await handleCheckID()
+      if (test) {
+        notifyActionError(intl.formatMessage({id: 'userRegistered'}))
+      } else {
+        const newActiveStep =
+          isLastStep() && !allStepsCompleted()
+            ? // It's the last step, but not all steps have been completed,
+            // find the first step that has been completed
+            steps.findIndex((step, i) => !(i in completed))
+            : activeStep + 1;
+        setActiveStep(newActiveStep);
+        scrollToTop();
+      }
+    } finally {
+      nextBusyRef.current = false;
+      setIsNextBusy(false);
     }
   };
 
@@ -214,7 +225,7 @@ const Register = () => {
             ) : (
               <Button
                 color="inherit"
-                disabled={activeStep === 0}
+                disabled={activeStep === 0 || isNextBusy}
                 onClick={handleBack}
                 sx={{ mr: 1 }}
               >
@@ -227,10 +238,20 @@ const Register = () => {
             <Stack sx={{ flex: '1 1 auto' }} />
             {activeStep === totalSteps() - 2 ?
               (
-                <Button variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
-                  <Typography variant="h5">
-                    <FormattedMessage id="submit"/>
-                  </Typography>
+                <Button
+                  variant="outlined"
+                  disabled={isNextBusy}
+                  onClick={handleNext}
+                  aria-busy={isNextBusy}
+                  sx={{ mr: 1, minWidth: 120 }}
+                >
+                  {isNextBusy ? (
+                    <CircularProgress size={22} color="inherit" aria-hidden />
+                  ) : (
+                    <Typography variant="h5">
+                      <FormattedMessage id="submit"/>
+                    </Typography>
+                  )}
                 </Button>
               ) : (activeStep === totalSteps() - 1 ?
                 (
@@ -243,7 +264,7 @@ const Register = () => {
                 ) :
                 (
                   // <Button disabled={updateValid} variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
-                  <Button disabled={!updateValid} variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
+                  <Button disabled={!updateValid || isNextBusy} variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
                     <Typography variant="h5">
                       <FormattedMessage id="continue"/>
                     </Typography>
diff --git a/src/pages/authentication/Register.js b/src/pages/authentication/Register.js
index e0ed41e..0999f4c 100644
--- a/src/pages/authentication/Register.js
+++ b/src/pages/authentication/Register.js
@@ -13,6 +13,7 @@ import {
   Stack,
   Typography,
   Button, StepLabel,
+  CircularProgress,
 } from '@mui/material';
 import VisibilityIcon from '@mui/icons-material/Visibility';
 import { POST_USERNAME, POST_VERIFY_CAPTCHA  } from "utils/ApiPathConst";
@@ -36,6 +37,8 @@ const Register = () => {
   const [username, setUsername] = useState("");
   const [base64Url, setBase64Url] = useState("")
   const [checkCode, setCheckCode] = useState("")
+  const [isNextBusy, setIsNextBusy] = useState(false);
+  const nextBusyRef = useRef(false);
   const intl = useIntl();
   // Localized document title/meta for register flow
   usePageTitle("register");
@@ -102,31 +105,39 @@ const Register = () => {
 
 
   const handleNext = async () => {
-    if (activeStep === 0 && step0GuardRef.current) {
-      const step0Ok = await Promise.resolve(step0GuardRef.current());
-      if (!step0Ok) {
-        return;
+    if (nextBusyRef.current) return;
+    nextBusyRef.current = true;
+    setIsNextBusy(true);
+    try {
+      if (activeStep === 0 && step0GuardRef.current) {
+        const step0Ok = await Promise.resolve(step0GuardRef.current());
+        if (!step0Ok) {
+          return;
+        }
       }
-    }
 
-    const captchaTest = await handleCaptcha();
-    if (!captchaTest) {
-      notifyActionError(intl.formatMessage({id: 'validVerify'}))
-      return;
-    }
+      const captchaTest = await handleCaptcha();
+      if (!captchaTest) {
+        notifyActionError(intl.formatMessage({id: 'validVerify'}))
+        return;
+      }
 
-    const test = await handleCheckUsername()
-    if (test) {
-      notifyActionError(intl.formatMessage({id: 'usernameTaken'}))
-    } else {
-      const newActiveStep =
-        isLastStep() && !allStepsCompleted()
-          ? // It's the last step, but not all steps have been completed,
-          // find the first step that has been completed
-          steps.findIndex((step, i) => !(i in completed))
-          : activeStep + 1;
-      setActiveStep(newActiveStep);
-      scrollToTop();
+      const test = await handleCheckUsername()
+      if (test) {
+        notifyActionError(intl.formatMessage({id: 'usernameTaken'}))
+      } else {
+        const newActiveStep =
+          isLastStep() && !allStepsCompleted()
+            ? // It's the last step, but not all steps have been completed,
+            // find the first step that has been completed
+            steps.findIndex((step, i) => !(i in completed))
+            : activeStep + 1;
+        setActiveStep(newActiveStep);
+        scrollToTop();
+      }
+    } finally {
+      nextBusyRef.current = false;
+      setIsNextBusy(false);
     }
   };
 
@@ -229,7 +240,7 @@ const Register = () => {
             ) : (
               <Button
                 color="inherit"
-                disabled={activeStep === 0}
+                disabled={activeStep === 0 || isNextBusy}
                 onClick={handleBack}
                 sx={{ mr: 1 }}
                 variant="h5"
@@ -243,10 +254,20 @@ const Register = () => {
             <Stack sx={{ flex: '1 1 auto' }} />
             {activeStep === totalSteps() - 2 ?
               (
-                <Button variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
-                  <Typography variant="h5">
-                    <FormattedMessage id="submit"/>
-                  </Typography>
+                <Button
+                  variant="outlined"
+                  disabled={isNextBusy}
+                  onClick={handleNext}
+                  aria-busy={isNextBusy}
+                  sx={{ mr: 1, minWidth: 120 }}
+                >
+                  {isNextBusy ? (
+                    <CircularProgress size={22} color="inherit" aria-hidden />
+                  ) : (
+                    <Typography variant="h5">
+                      <FormattedMessage id="submit"/>
+                    </Typography>
+                  )}
                 </Button>
               ) : (activeStep === totalSteps() - 1 ?
                 (
@@ -259,7 +280,7 @@ const Register = () => {
                 ) :
                 (
                   // <Button disabled={updateValid} variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
-                  <Button disabled={!updateValid} variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
+                  <Button disabled={!updateValid || isNextBusy} variant="outlined" onClick={handleNext} sx={{ mr: 1 }}>
                     <Typography variant="h5">
                       <FormattedMessage id="continue"/>
                     </Typography>