diff --git a/projects/core/src/lib/classes/mask-model/mask-model.ts b/projects/core/src/lib/classes/mask-model/mask-model.ts
index eee3003cc..1bf3cc318 100644
--- a/projects/core/src/lib/classes/mask-model/mask-model.ts
+++ b/projects/core/src/lib/classes/mask-model/mask-model.ts
@@ -10,7 +10,7 @@ export class MaskModel implements ElementState {
 
     constructor(
         readonly initialElementState: ElementState,
-        private readonly maskOptions: MaskitoOptions,
+        private readonly maskOptions: Required<MaskitoOptions>,
     ) {
         const {value, selection} = calibrateValueByMask(
             initialElementState,
@@ -37,23 +37,34 @@ export class MaskModel implements ElementState {
             newCharacters,
             this.maskOptions.overwriteMode,
         ).selection;
-        const newUnmaskedValue =
-            unmaskedElementState.value.slice(0, unmaskedFrom) +
-            newCharacters +
-            unmaskedElementState.value.slice(unmaskedTo);
-
-        const newCaretIndex = unmaskedFrom + newCharacters.length;
+        const newUnmaskedLeadingValuePart =
+            unmaskedElementState.value.slice(0, unmaskedFrom) + newCharacters;
+        const newCaretIndex = newUnmaskedLeadingValuePart.length;
         const maskedElementState = calibrateValueByMask(
             {
-                value: newUnmaskedValue,
+                value:
+                    newUnmaskedLeadingValuePart +
+                    unmaskedElementState.value.slice(unmaskedTo),
                 selection: [newCaretIndex, newCaretIndex],
             },
             maskExpression,
             initialElementState,
         );
+        const isInvalidCharsInsertion =
+            value.slice(0, unmaskedFrom) ===
+            calibrateValueByMask(
+                {
+                    value: newUnmaskedLeadingValuePart,
+                    selection: [newCaretIndex, newCaretIndex],
+                },
+                maskExpression,
+                initialElementState,
+            ).value;
 
-        if (areElementStatesEqual(this, maskedElementState)) {
-            // If typing new characters does not change value
+        if (
+            isInvalidCharsInsertion ||
+            areElementStatesEqual(this, maskedElementState) // If typing new characters does not change value
+        ) {
             throw new Error('Invalid mask value');
         }
 
diff --git a/projects/core/src/lib/classes/mask-model/tests/mask-model-fixed-characters.spec.ts b/projects/core/src/lib/classes/mask-model/tests/mask-model-fixed-characters.spec.ts
index e2ce5b5c0..936899844 100644
--- a/projects/core/src/lib/classes/mask-model/tests/mask-model-fixed-characters.spec.ts
+++ b/projects/core/src/lib/classes/mask-model/tests/mask-model-fixed-characters.spec.ts
@@ -1,9 +1,11 @@
+import {MASKITO_DEFAULT_OPTIONS} from '../../../constants';
 import {MaskitoOptions} from '../../../types';
 import {MaskModel} from '../mask-model';
 
 describe('MaskModel | Fixed characters', () => {
     describe('New typed character is equal to the previous (already existing) fixed character', () => {
-        const phoneMaskitoOptions: MaskitoOptions = {
+        const phoneMaskitoOptions: Required<MaskitoOptions> = {
+            ...MASKITO_DEFAULT_OPTIONS,
             mask: [
                 '+',
                 '7',
diff --git a/projects/demo-integrations/cypress/tests/kit/number/number-decimal-zero-padding.cy.ts b/projects/demo-integrations/cypress/tests/kit/number/number-decimal-zero-padding.cy.ts
index 73925309e..e3ef3309e 100644
--- a/projects/demo-integrations/cypress/tests/kit/number/number-decimal-zero-padding.cy.ts
+++ b/projects/demo-integrations/cypress/tests/kit/number/number-decimal-zero-padding.cy.ts
@@ -87,4 +87,58 @@ describe('Number | decimalZeroPadding', () => {
             .should('have.prop', 'selectionStart', ','.length)
             .should('have.prop', 'selectionEnd', ','.length);
     });
+
+    describe('Extra decimal separator insertion', () => {
+        it('42,|2700 => Type , => 42,|2700', () => {
+            cy.get('@input')
+                .type('42,27')
+                .type('{leftArrow}'.repeat('27'.length))
+                .should('have.value', '42,2700')
+                .should('have.prop', 'selectionStart', '42,'.length)
+                .should('have.prop', 'selectionEnd', '42,'.length)
+                .type(',')
+                .should('have.value', '42,2700')
+                .should('have.prop', 'selectionStart', '42,'.length)
+                .should('have.prop', 'selectionEnd', '42,'.length);
+        });
+
+        it('42|,2700 => Type , => 42,|2700', () => {
+            cy.get('@input')
+                .type('42,27')
+                .type('{leftArrow}'.repeat(',27'.length))
+                .should('have.value', '42,2700')
+                .should('have.prop', 'selectionStart', '42'.length)
+                .should('have.prop', 'selectionEnd', '42'.length)
+                .type(',')
+                .should('have.value', '42,2700')
+                .should('have.prop', 'selectionStart', '42,'.length)
+                .should('have.prop', 'selectionEnd', '42,'.length);
+        });
+
+        it('42,2|700 => Type , => 42,2|700', () => {
+            cy.get('@input')
+                .type('42,27')
+                .type('{leftArrow}')
+                .should('have.value', '42,2700')
+                .should('have.prop', 'selectionStart', '42,2'.length)
+                .should('have.prop', 'selectionEnd', '42,2'.length)
+                .type(',')
+                .should('have.value', '42,2700')
+                .should('have.prop', 'selectionStart', '42,2'.length)
+                .should('have.prop', 'selectionEnd', '42,2'.length);
+        });
+
+        it('9|9,1234 => Type , => 9,|9123', () => {
+            cy.get('@input')
+                .type('99,1234')
+                .type('{moveToStart}{rightArrow}')
+                .should('have.value', '99,1234')
+                .should('have.prop', 'selectionStart', 1)
+                .should('have.prop', 'selectionEnd', 1)
+                .type(',')
+                .should('have.value', '9,9123')
+                .should('have.prop', 'selectionStart', 2)
+                .should('have.prop', 'selectionEnd', 2);
+        });
+    });
 });