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samterm: fix crash on scroll when there is no layer (thanks BurnZeZ)

--- a/sys/src/cmd/samterm/main.c

+++ b/sys/src/cmd/samterm/main.c

@@ -310,6 +310,9 @@

 {

 	Text *t=(Text *)l->user1;

+	if(t->tag == Untagged)

+		return;

+

 	switch(but){

 	case 1:

 		outTsll(Torigin, t->tag, l->origin, p0);

-- 

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