--- w_dir.c
+++ w_dir.c	2004-03-22 12:17:21.000000000 +0000
@@ -126,6 +126,8 @@
 {
     XawListReturnStruct *ret_struct = (XawListReturnStruct *) call_data;
 
+    if (!ret_struct)
+	return;
     strcpy(CurrentSelectionName, ret_struct->string);
     FirstArg(XtNstring, CurrentSelectionName);
     if (browse_up) {
@@ -160,6 +162,8 @@
 {
     XawListReturnStruct *ret_struct = (XawListReturnStruct *) call_data;
 
+    if (!ret_struct)
+	return;
     strcpy(CurrentSelectionName, ret_struct->string);
     DoChangeDir(CurrentSelectionName);
 }
--- w_library.c
+++ w_library.c	2004-03-22 12:19:10.000000000 +0000
@@ -461,6 +461,8 @@
     int		    new_obj;
     XawListReturnStruct *ret_struct = (XawListReturnStruct *) call_data;
 
+    if (!ret_struct)
+	return;
     new_obj = ret_struct->list_index;
     if (icons_made) {
 	/* unhighlight the current view icon */
--- w_srchrepl.c
+++ w_srchrepl.c	2004-03-22 12:20:38.000000000 +0000
@@ -883,6 +883,9 @@ spell_select_word(Widget widget, XtPoint
 {
     XawListReturnStruct *ret_struct = (XawListReturnStruct *) call_data;
 
+    if (!ret_struct)
+	return;
+
     /* make correct button and correction entry sensitive */
     XtSetSensitive(correct_button, True);
     XtSetSensitive(correct_word, True);