diff --git a/lib/workers/repository/cache.ts b/lib/workers/repository/cache.ts
index 7f23e4e088a24f..55dc4beac8ea68 100644
--- a/lib/workers/repository/cache.ts
+++ b/lib/workers/repository/cache.ts
@@ -92,6 +92,9 @@ async function generateBranchCache(
           baseBranch,
           baseBranchSha,
         ) ?? undefined;
+    } else if (baseBranchSha && !branchSha && branch.prNo) {
+      // if branch was deleted/ PR exists and ignored
+      prNo = branch.prNo;
     }
 
     const automerge = !!branch.automerge;