diff --git a/armagedec.tcl b/armagedec.tcl
index d99672c..880f2b6 100755
--- a/armagedec.tcl
+++ b/armagedec.tcl
@@ -7,7 +7,7 @@
 
 package require Tk
 
-set appversion 0.3
+set appversion 0.4
 set scriptpath [file normalize [info script]]
 set appdir [file dirname $scriptpath]
 # check if we're running from a starpack
@@ -359,7 +359,9 @@ proc fullscanscheme {version} {
     if {$size eq 1} {set fmt cu}
     if {$size eq 2} {set fmt s}
     if {$size eq 4} {set fmt i}
-    binary scan [string range $rawschemedata $offs [expr {$offs + $size}]] $fmt wscval
+    set newval ""
+    binary scan [string range $rawschemedata $offs [expr {$offs + $size}]] $fmt newval
+    if {$newval ne ""} {set wscval $newval}
     if {([llength $valopt] > 1) && ([lindex $valopt 0] eq "spec")} {
       set readfunc "[lindex $valopt 1]_read"
       set wscval [$readfunc $wscval]