diff --git a/ggml.c b/ggml.c
index 539085ed0..f3e093564 100644
--- a/ggml.c
+++ b/ggml.c
@@ -5819,7 +5819,7 @@ struct ggml_tensor * ggml_cont_impl(
     bool is_node = false;
 
     if (!inplace && a->grad) {
-        GGML_ASSERT(false); // TODO: implement backward
+        // TODO: implement backward
         is_node = true;
     }
 
diff --git a/tests/test-grad0.c b/tests/test-grad0.c
index c192fd07d..cfc2c94ad 100644
--- a/tests/test-grad0.c
+++ b/tests/test-grad0.c
@@ -385,7 +385,7 @@ int main(int argc, const char ** argv) {
 
         // mul_mat
         {
-            const int nargs = 1;
+            const int nargs = 2;
 
             for (int ndims = 2; ndims <= 2; ++ndims) {
                 x[0] = get_random_tensor(ctx0, ndims, ne, -1.0f, 1.0f);
@@ -397,6 +397,7 @@ int main(int argc, const char ** argv) {
                 }
 
                 ggml_set_param(ctx0, x[0]);
+                ggml_set_param(ctx0, x[1]);
 
                 struct ggml_tensor * m = ggml_mul_mat(ctx0, x[1], x[0]);
                 struct ggml_tensor * f = ggml_sum(ctx0, m);