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-rw-r--r--render/layout.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/render/layout.c b/render/layout.c
index af7ca565f..a1e470433 100644
--- a/render/layout.c
+++ b/render/layout.c
@@ -903,6 +903,8 @@ bool layout_line(struct box *first, int width, int *y,
/* pass 2: place boxes in line: loop body executed at least once */
for (x = x_previous = 0, b = first; x <= x1 - x0 && b; b = b->next) {
if (b->type == BOX_INLINE || b->type == BOX_INLINE_BLOCK) {
+ assert(b->width != UNKNOWN_WIDTH);
+
x_previous = x;
x += space_after;
b->x = x;