diff --git a/iOS/Plugins/FlipperKitUserDefaultsPlugin/FKUserDefaultsSwizzleUtility.m b/iOS/Plugins/FlipperKitUserDefaultsPlugin/FKUserDefaultsSwizzleUtility.m
index 5c02fd02d..4f4965ed4 100644
--- a/iOS/Plugins/FlipperKitUserDefaultsPlugin/FKUserDefaultsSwizzleUtility.m
+++ b/iOS/Plugins/FlipperKitUserDefaultsPlugin/FKUserDefaultsSwizzleUtility.m
@@ -59,7 +59,9 @@
         NSString* originalStr =
             [@"comfacebookFlipperKit_" stringByAppendingString:selStr];
         [invocation setSelector:NSSelectorFromString(originalStr)];
-        block(invocation);
+        if (block != nil) {
+          block(invocation);
+        }
       } else {
         ((void (*)(id, SEL, NSInvocation*))orig)(this, fwdSel, invocation);
       }