Fix: Use try-except to stabilize token counter during model access

This fixes a server crash (TypeError NoneType in torch/nn/modules/module.py) when the token counter API is triggered during model load/switch.

Standard sequential null checks failed because the crash occurred inside PyTorch's internal attribute lookup process. The whole function is wrapped in try-except as a robust defense against this race condition.

scripts/physton_prompt/get_token_counter.py

@@ -4,39 +4,41 @@ from functools import partial, reduce
 
 
 def get_token_counter(text, steps):
-    # FIX: Robust Null Check to prevent TypeError during model loading/unloading.
+    # FIX: Use try-except to safely handle PyTorch/model access errors (TypeError NoneType)
-    # Checks for the existence of model_data and its property sd_model sequentially.
+    # that occur during model loading/switching when the token counter API is triggered.
-    if sd_models.model_data is None or sd_models.model_data.sd_model is None:
+    try:
+        # copy from modules.ui.py
+        try:
+            text, _ = extra_networks.parse_prompt(text)
+
+            _, prompt_flat_list, _ = prompt_parser.get_multicond_prompt_list([text])
+            prompt_schedules = prompt_parser.get_learned_conditioning_prompt_schedules(prompt_flat_list, steps)
+
+        except Exception:
+            # a parsing error can happen here during typing, and we don't want to bother the user with
+            # messages related to it in console
+            prompt_schedules = [[[steps, text]]]
+
+        try:
+            from modules_forge import forge_version
+            forge = True
+
+        except:
+            forge = False
+
+        flat_prompts = reduce(lambda list1, list2: list1 + list2, prompt_schedules)
+        prompts = [prompt_text for step, prompt_text in flat_prompts]
+
+        if forge:
+            cond_stage_model = sd_models.model_data.sd_model.cond_stage_model
+            token_count, max_length = max([model_hijack.get_prompt_lengths(prompt,cond_stage_model) for prompt in prompts],
+                                        key=lambda args: args[0])
+        else:
+            token_count, max_length = max([model_hijack.get_prompt_lengths(prompt) for prompt in prompts],
+                                        key=lambda args: args[0])
+
+        return {"token_count": token_count, "max_length": max_length}
+
+    except Exception as e:
+        # return 0 token count if any error (model instability, parsing error, etc.) occurs during calculation
         return {"token_count": 0, "max_length": 0}
-
-    # copy from modules.ui.py
-    try:
-        text, _ = extra_networks.parse_prompt(text)
-
-        _, prompt_flat_list, _ = prompt_parser.get_multicond_prompt_list([text])
-        prompt_schedules = prompt_parser.get_learned_conditioning_prompt_schedules(prompt_flat_list, steps)
-
-    except Exception:
-        # a parsing error can happen here during typing, and we don't want to bother the user with
-        # messages related to it in console
-        prompt_schedules = [[[steps, text]]]
-
-    try:
-        from modules_forge import forge_version
-        forge = True
-
-    except:
-        forge = False
-
-    flat_prompts = reduce(lambda list1, list2: list1 + list2, prompt_schedules)
-    prompts = [prompt_text for step, prompt_text in flat_prompts]
-
-    if forge:
-        cond_stage_model = sd_models.model_data.sd_model.cond_stage_model
-        token_count, max_length = max([model_hijack.get_prompt_lengths(prompt,cond_stage_model) for prompt in prompts],
-                                      key=lambda args: args[0])
-    else:
-        token_count, max_length = max([model_hijack.get_prompt_lengths(prompt) for prompt in prompts],
-                                      key=lambda args: args[0])
-
-    return {"token_count": token_count, "max_length": max_length}