diff --git a/.changeset/warm-hats-sneeze.md b/.changeset/warm-hats-sneeze.md
new file mode 100644
index 00000000..a548143f
--- /dev/null
+++ b/.changeset/warm-hats-sneeze.md
@@ -0,0 +1,5 @@
+---
+"rescript-relay-router": patch
+---
+
+fix prepare route when route renderer still pending
diff --git a/packages/rescript-relay-router/src/RelayRouter__Internal__DeclarationsSupport.res b/packages/rescript-relay-router/src/RelayRouter__Internal__DeclarationsSupport.res
index 31d19645..92f2f99f 100644
--- a/packages/rescript-relay-router/src/RelayRouter__Internal__DeclarationsSupport.res
+++ b/packages/rescript-relay-router/src/RelayRouter__Internal__DeclarationsSupport.res
@@ -351,6 +351,9 @@ let makePrepareAssets = (~loadedRouteRenderers, ~prepareDisposeTimeout): prepare
               preparedProps,
             ),
           )
+        | (Some(Pending(promise)), Loaded(_)) =>
+          suspend(promise)
+          React.null
         | _ =>
           Console.log("Warning: Invalid state")
           React.null