diff --git a/imgui-binding/src/main/java/imgui/ImGui.java b/imgui-binding/src/main/java/imgui/ImGui.java
index 42f00d7..ed1349d 100644
--- a/imgui-binding/src/main/java/imgui/ImGui.java
+++ b/imgui-binding/src/main/java/imgui/ImGui.java
@@ -3147,7 +3147,7 @@ public class ImGui {
         userData.textInputData = &textInputData;
         userData.env = env;
         userData.allowedChars = allowedChars;
-        userData.handler = &callback;
+        userData.handler = callback != NULL ? &callback : NULL;
 
         bool valueChanged;