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-rw-r--r--Src/subst.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Src/subst.c b/Src/subst.c
index d027e3d83..a265a187e 100644
--- a/Src/subst.c
+++ b/Src/subst.c
@@ -2430,7 +2430,7 @@ paramsubst(LinkList l, LinkNode n, char **str, int qt, int pf_flags,
 		val = aval[0];
 		isarr = 0;
 	    }
-	    s = dyncat(val, s);
+	    s = val ? dyncat(val, s) : dupstring(s);
 	    /* Now behave po-faced as if it was always like that... */
 	    subexp = 0;
 	    /*