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-rw-r--r--metapost/context/base/mp-char.mpiv4
1 files changed, 3 insertions, 1 deletions
diff --git a/metapost/context/base/mp-char.mpiv b/metapost/context/base/mp-char.mpiv
index 5450ed972..83fa20155 100644
--- a/metapost/context/base/mp-char.mpiv
+++ b/metapost/context/base/mp-char.mpiv
@@ -298,7 +298,9 @@ def flow_flush_shape(expr x, yy) =
enddef ;
vardef flow_points_initialized(expr xfrom, yfrom, xto, yto, n) =
- if not flow_xyfree[xfrom][yfrom] and not flow_xyfree[xto][yto] :
+ if unknown flow_xyfree[xfrom][yfrom] or unknown flow_xyfree[xto][yto] :
+ flow_xypoint := 0 ; false
+ elseif not flow_xyfree[xfrom][yfrom] and not flow_xyfree[xto][yto] :
flow_xypoint := n ; true
else :
flow_xypoint := 0 ; false