loader: do not crash on invalid shareCachedItem

It could be legitimate.

(Although I found it in a case where it likely isn't legitimate.
But that's another question...)

1 files changed, 4 insertions, 3 deletions

diff --git a/src/server/loader.nim b/src/server/loader.nim
index e20020e8..31bd2d50 100644
--- a/src/server/loader.nim
+++ b/src/server/loader.nim
@@ -1455,9 +1455,10 @@ proc shareCachedItem(ctx: LoaderContext; stream: SocketStream;
   let sourceClient = ctx.clientMap[sourcePid]
   let targetClient = ctx.clientMap[targetPid]
   let n = sourceClient.cacheMap.find(id)
-  let item = sourceClient.cacheMap[n]
-  inc item.refc
-  targetClient.cacheMap.add(item)
+  if n != -1:
+    let item = sourceClient.cacheMap[n]
+    inc item.refc
+    targetClient.cacheMap.add(item)
 
 proc openCachedItem(ctx: LoaderContext; stream: SocketStream;
     client: ClientHandle; r: var BufferedReader) =