diff --git a/components/lib/inputnumber/InputNumber.js b/components/lib/inputnumber/InputNumber.js
index ee0b4cf8d3..7aac9c9a14 100644
--- a/components/lib/inputnumber/InputNumber.js
+++ b/components/lib/inputnumber/InputNumber.js
@@ -891,7 +891,7 @@ export const InputNumber = React.memo(
 
                 _decimal.current.lastIndex = 0;
 
-                return decimalCharIndex !== -1 ? val1.split(_decimal.current)[0] + val2.slice(decimalCharIndex) : val1;
+                return decimalCharIndex !== -1 ? replaceSuffix(val1.split(_decimal.current)[0]) + val2.slice(decimalCharIndex) : val1;
             }
 
             return val1;
@@ -902,13 +902,17 @@ export const InputNumber = React.memo(
                 const valueSplit = value.split(_decimal.current);
 
                 if (valueSplit.length === 2) {
-                    return valueSplit[1].replace(_suffix.current, '').trim().replace(/\s/g, '').replace(_currency.current, '').length;
+                    return replaceSuffix(valueSplit[1]).length;
                 }
             }
 
             return 0;
         };
 
+        const replaceSuffix = (value) => {
+            return value ? value.replace(_suffix.current, '').trim().replace(/\s/g, '').replace(_currency.current, '') : value;
+        };
+
         const updateModel = (event, value) => {
             if (props.onValueChange) {
                 props.onValueChange({