Index: src/network-mysqld.c
===================================================================
--- src/network-mysqld.c	(revision 369)
+++ src/network-mysqld.c	(working copy)
@@ -1337,10 +1337,14 @@
 				/**
 				 * writing failed, closing connection
 				 */
+				g_debug("%s.%d: network_mysqld_write(CON_STATE_SEND_HANDSHAKE) returned an error", __FILE__, __LINE__);
 				con->state = CON_STATE_ERROR;
 				break;
 			}
 
+			/* if the write failed, don't call the plugin handlers */
+			if (con->state == CON_STATE_ERROR) break;
+
 			switch (plugin_call(srv, con, con->state)) {
 			case RET_SUCCESS:
 				break;