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-rw-r--r--src/strings.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/strings.c b/src/strings.c
index 7a99cd964..0313e7480 100644
--- a/src/strings.c
+++ b/src/strings.c
@@ -898,6 +898,7 @@ string_filter_map(
break;
len = (int)STRLEN(tv.vval.v_string);
+ newtv.v_type = VAR_UNKNOWN;
set_vim_var_nr(VV_KEY, idx);
if (filter_map_one(&tv, expr, filtermap, &newtv, &rem) == FAIL
|| did_emsg)