Index: src_plugins/dialogs/dlg_library.c
===================================================================
--- src_plugins/dialogs/dlg_library.c	(revision 37273)
+++ src_plugins/dialogs/dlg_library.c	(revision 37274)
@@ -433,6 +433,7 @@
 	attr = &ctx->dlg[ctx->wtree];
 	tree = attr->wdata;
 	otext = attr_inp->val.str;
+	if (otext == NULL) otext = "";
 	text = rnd_strdup(otext);
 	have_filter_text = (*text != '\0');