diff --git a/openbsc/src/gprs/gb_proxy_vty.c b/openbsc/src/gprs/gb_proxy_vty.c
index 8a7523c..3042cf5 100644
--- a/openbsc/src/gprs/gb_proxy_vty.c
+++ b/openbsc/src/gprs/gb_proxy_vty.c
@@ -666,6 +666,8 @@
 				continue;
 			break;
 		case MATCH_IMSI:
+			if (!link_info->imsi)
+				continue;
 			mi_buf[0] = '\0';
 			gsm48_mi_to_string(mi_buf, sizeof(mi_buf),
 					   link_info->imsi,