diff --git a/src/net_processing.cpp b/src/net_processing.cpp
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -2295,6 +2295,7 @@
             pfrom->nTimeOffset = nTimeOffset;
             AddTimeData(pfrom->addr, nTimeOffset);
         } else {
+            LOCK(cs_main);
             Misbehaving(pfrom, 20,
                         "Ignoring invalid timestamp in version message");
         }