diff --git a/front/views/SigninView.tsx b/front/views/SigninView.tsx
index 1405e86..35f1217 100644
--- a/front/views/SigninView.tsx
+++ b/front/views/SigninView.tsx
@@ -74,12 +74,12 @@ const SigninView = () => {
 					value={formData.username.value}
 					onChangeText={(t) => {
 						let error: null | string = null;
-						validationSchemas.username
-							.validate(t)
-							.catch((e) => (error = e.message))
-							.finally(() => {
-								setFormData({ ...formData, username: { value: t, error } });
-							});
+						try {
+							validationSchemas.username.validateSync(t);
+						} catch (e: any) {
+							error = e.message;
+						}
+						setFormData({ ...formData, username: { value: t, error } });
 					}}
 					isRequired
 				/>,
@@ -93,12 +93,12 @@ const SigninView = () => {
 					value={formData.password.value}
 					onChangeText={(t) => {
 						let error: null | string = null;
-						validationSchemas.password
-							.validate(t)
-							.catch((e) => (error = e.message))
-							.finally(() => {
-								setFormData({ ...formData, password: { value: t, error } });
-							});
+						try {
+							validationSchemas.password.validateSync(t);
+						} catch (e: any) {
+							error = e.message;
+						}
+						setFormData({ ...formData, password: { value: t, error } });
 					}}
 					isRequired
 					isSecret
diff --git a/front/views/SignupView.tsx b/front/views/SignupView.tsx
index 7401d66..13df2a2 100644
--- a/front/views/SignupView.tsx
+++ b/front/views/SignupView.tsx
@@ -88,12 +88,12 @@ const SignupView = () => {
 					value={formData.username.value}
 					onChangeText={(t) => {
 						let error: null | string = null;
-						validationSchemas.username
-							.validate(t)
-							.catch((e) => (error = e.message))
-							.finally(() => {
-								setFormData({ ...formData, username: { value: t, error } });
-							});
+						try {
+							validationSchemas.username.validateSync(t);
+						} catch (e: any) {
+							error = e.message;
+						}
+						setFormData({ ...formData, username: { value: t, error } });
 					}}
 					isRequired
 				/>,
@@ -106,12 +106,12 @@ const SignupView = () => {
 					value={formData.email.value}
 					onChangeText={(t) => {
 						let error: null | string = null;
-						validationSchemas.email
-							.validate(t)
-							.catch((e) => (error = e.message))
-							.finally(() => {
-								setFormData({ ...formData, email: { value: t, error } });
-							});
+						try {
+							validationSchemas.email.validateSync(t);
+						} catch (e: any) {
+							error = e.message;
+						}
+						setFormData({ ...formData, email: { value: t, error } });
 					}}
 					isRequired
 				/>,
@@ -126,12 +126,12 @@ const SignupView = () => {
 					value={formData.password.value}
 					onChangeText={(t) => {
 						let error: null | string = null;
-						validationSchemas.password
-							.validate(t)
-							.catch((e) => (error = e.message))
-							.finally(() => {
-								setFormData({ ...formData, password: { value: t, error } });
-							});
+						try {
+							validationSchemas.password.validateSync(t);
+						} catch (e: any) {
+							error = e.message;
+						}
+						setFormData({ ...formData, password: { value: t, error } });
 					}}
 				/>,
 				<TextFormField
@@ -145,18 +145,18 @@ const SignupView = () => {
 					value={formData.repeatPassword.value}
 					onChangeText={(t) => {
 						let error: null | string = null;
-						validationSchemas.password
-							.validate(t)
-							.catch((e) => (error = e.message))
-							.finally(() => {
-								if (!error && t !== formData.password.value) {
-									error = translate('passwordsDontMatch');
-								}
-								setFormData({
-									...formData,
-									repeatPassword: { value: t, error },
-								});
-							});
+						try {
+							validationSchemas.password.validateSync(t);
+						} catch (e: any) {
+							error = e.message;
+						}
+						if (!error && t !== formData.password.value) {
+							error = translate('passwordsDontMatch');
+						}
+						setFormData({
+							...formData,
+							repeatPassword: { value: t, error },
+						});
 					}}
 				/>,
 			]}