diff --git a/python/sglang/srt/disaggregation/common/conn.py b/python/sglang/srt/disaggregation/common/conn.py
index 824cce206..39666b558 100644
--- a/python/sglang/srt/disaggregation/common/conn.py
+++ b/python/sglang/srt/disaggregation/common/conn.py
@@ -331,14 +331,21 @@ class CommonKVManager(BaseKVManager):
             and local_source_fingerprint is not None
             and info.runtime_source_fingerprint != local_source_fingerprint
         ):
-            raise RuntimeError(
-                "Runtime source fingerprint mismatch between prefill and decode. "
-                "This can corrupt disaggregated KV transfer contracts. "
-                f"prefill_fingerprint={info.runtime_source_fingerprint}, "
-                f"decode_fingerprint={local_source_fingerprint}, "
-                f"prefill_source_root={info.runtime_source_root}, "
-                f"decode_source_root={get_runtime_source_root()}. "
-                "Restart both prefill and decode from the same source tree."
+            # Advisory only: the fingerprint hashes the whole source tree, so
+            # ANY code difference trips it — including changes that do not
+            # touch the KV transfer contract (a prefill-only restart with a
+            # one-line fix used to CRASH the decode scheduler here).  The
+            # contract-relevant mismatches (page size, kv dtype) are checked
+            # above and still fail hard.
+            logger.warning(
+                "Runtime source fingerprint differs between prefill and decode "
+                "(prefill_fingerprint=%s, decode_fingerprint=%s, "
+                "prefill_source_root=%s, decode_source_root=%s). Make sure the "
+                "KV transfer layout contract is unchanged between the trees.",
+                info.runtime_source_fingerprint,
+                local_source_fingerprint,
+                info.runtime_source_root,
+                get_runtime_source_root(),
             )
 
         self._resolve_rank_mapping(info)