diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b51925e8f..5234be8b7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 #### :bug: Bug fix
 
 - Editor: Fix issue where pipe completions would not trigger with generic type arguments. https://github.com/rescript-lang/rescript/pull/7231
+- Fix leftover assert false in code for `null != undefined`. https://github.com/rescript-lang/rescript/pull/7232
 
 # 12.0.0-alpha.7
 
diff --git a/compiler/core/js_exp_make.ml b/compiler/core/js_exp_make.ml
index 652f1d844d..8980667ff2 100644
--- a/compiler/core/js_exp_make.ml
+++ b/compiler/core/js_exp_make.ml
@@ -1752,9 +1752,7 @@ let neq_null_undefined_boolean ?comment (a : t) (b : t) =
     true_
   | Null, Null | Undefined _, Undefined _ -> false_
   | Null, Undefined _ | Undefined _, Null -> true_
-  | _ ->
-    let _ = assert false in
-    {expression_desc = Bin (NotEqEq, a, b); comment}
+  | _ -> {expression_desc = Bin (NotEqEq, a, b); comment}
 
 let make_exception (s : string) =
   pure_runtime_call Primitive_modules.exceptions Literals.create [str s]
diff --git a/tests/tests/src/test_zero_nullable.mjs b/tests/tests/src/test_zero_nullable.mjs
index ebb251de0f..1cf2904609 100644
--- a/tests/tests/src/test_zero_nullable.mjs
+++ b/tests/tests/src/test_zero_nullable.mjs
@@ -295,6 +295,16 @@ eq("File \"test_zero_nullable.res\", line 255, characters 5-12", f1$1(undefined)
 
 Mt.from_pair_suites("Test_zero_nullable", suites.contents);
 
+let a = null;
+
+let res = a !== undefined;
+
+let Null_undefined_neq = {
+  a: a,
+  b: undefined,
+  res: res
+};
+
 export {
   suites,
   test_id,
@@ -302,5 +312,6 @@ export {
   Test_null,
   Test_def,
   Test_null_def,
+  Null_undefined_neq,
 }
 /* u Not a pure module */
diff --git a/tests/tests/src/test_zero_nullable.res b/tests/tests/src/test_zero_nullable.res
index fbc3c6ab1d..08d37ec31c 100644
--- a/tests/tests/src/test_zero_nullable.res
+++ b/tests/tests/src/test_zero_nullable.res
@@ -256,3 +256,9 @@ let () = {
 }
 
 let () = Mt.from_pair_suites(__MODULE__, suites.contents)
+
+module Null_undefined_neq = {
+  let a = null
+  let b = undefined
+  let res = a != b
+}