diff --git a/unsloth/models/rl.py b/unsloth/models/rl.py
index 0f1fa2dbf6..fe9951ddf0 100644
--- a/unsloth/models/rl.py
+++ b/unsloth/models/rl.py
@@ -727,6 +727,13 @@ def _patch_trl_rl_trainers(trainer_file = "grpo_trainer"):
         new_text = 'self._signature_columns = ["input_ids", "attention_mask", "completion_mask","labels"]'
         RLTrainer_source = RLTrainer_source.replace(original_text, new_text)
 
+        # Temporary patch _is_vlm to False
+        # as of 0.22 it only exists in sfttrainer
+        oriignal_is_vlm_text = 'self._is_vlm = True'
+        new_is_vlm_text = 'self._is_vlm = False'
+        RLTrainer_source = RLTrainer_source.replace(oriignal_is_vlm_text, new_is_vlm_text)
+
+
     # Remove multiple doc strings
     if __RLConfig_doc__ != "" and RLTrainer_source.count(__RLTrainer_doc__) == 2:
         RLTrainer_source = RLTrainer_source.replace(__RLTrainer_doc__, "", 1)