diff --git a/server/text_generation_server/utils/logits_process.py b/server/text_generation_server/utils/logits_process.py
index 6b915437..a59da3fe 100644
--- a/server/text_generation_server/utils/logits_process.py
+++ b/server/text_generation_server/utils/logits_process.py
@@ -521,7 +521,11 @@ class GrammarLogitProcessor(LogitsProcessor):
     def _cached_compile_fsm(grammar_type, schema, tokenizer):
         start_time = time.time()
         if grammar_type == GrammarType.GRAMMAR_TYPE_JSON:
-            schema = build_regex_from_schema(schema)
+            try:
+                schema = build_regex_from_schema(schema)
+            except Exception as e:
+                logger.error(f"Error compiling FSM: {e}")
+                return None
         elif grammar_type == GrammarType.GRAMMAR_TYPE_REGEX:
             pass  # schema is already a regex just here for clarity
         fsm = RegexFSM(schema, tokenizer)