diff -up scim-bridge-0.4.5/agent/scim-bridge-agent.cpp.segfault-412511 scim-bridge-0.4.5/agent/scim-bridge-agent.cpp
--- scim-bridge-0.4.5/agent/scim-bridge-agent.cpp.segfault-412511	2008-01-09 18:33:43.000000000 +0800
+++ scim-bridge-0.4.5/agent/scim-bridge-agent.cpp	2008-01-09 18:36:00.000000000 +0800
@@ -301,7 +301,7 @@ retval_t ScimBridgeAgentImpl::run_event_
 
             scim_bridge_agent_event_type_t events = SCIM_BRIDGE_AGENT_EVENT_NONE;
 
-            if (FD_ISSET (socket_fd, &read_set) && (triggers & SCIM_BRIDGE_AGENT_EVENT_READ)) {
+            if (socket_fd >= 0 && FD_ISSET (socket_fd, &read_set) && (triggers & SCIM_BRIDGE_AGENT_EVENT_READ)) {
                 if (events == SCIM_BRIDGE_AGENT_EVENT_NONE) {
                     scim_bridge_pdebug (2, "Invoked triggers: READ");
                 } else {
@@ -309,7 +309,7 @@ retval_t ScimBridgeAgentImpl::run_event_
                 }
                 events |= SCIM_BRIDGE_AGENT_EVENT_READ;
             }
-            if (FD_ISSET (socket_fd, &write_set) && (triggers & SCIM_BRIDGE_AGENT_EVENT_WRITE)) {
+            if (socket_fd >= 0 && FD_ISSET (socket_fd, &write_set) && (triggers & SCIM_BRIDGE_AGENT_EVENT_WRITE)) {
                 if (events == SCIM_BRIDGE_AGENT_EVENT_NONE) {
                     scim_bridge_pdebug (2, "Invoked triggers: WRITE");
                 } else {
@@ -317,7 +317,7 @@ retval_t ScimBridgeAgentImpl::run_event_
                 }
                 events |= SCIM_BRIDGE_AGENT_EVENT_WRITE;
             }
-            if (FD_ISSET (socket_fd, &error_set) && (triggers & SCIM_BRIDGE_AGENT_EVENT_ERROR)) {
+            if (socket_fd >= 0 && FD_ISSET (socket_fd, &error_set) && (triggers & SCIM_BRIDGE_AGENT_EVENT_ERROR)) {
                 if (events == SCIM_BRIDGE_AGENT_EVENT_NONE) {
                     scim_bridge_pdebug (2, "Invoked triggers: ERROR");
                 } else {