diff --git a/.serena/memories/common/layout-grid-subtleties.md b/.serena/memories/common/layout-grid-subtleties.md
index 2a48b9d149..845ca64f8b 100644
--- a/.serena/memories/common/layout-grid-subtleties.md
+++ b/.serena/memories/common/layout-grid-subtleties.md
@@ -5,6 +5,13 @@
 - Layout container data and child layout-item data are removed by different helpers. Do not assume clearing a layout frame also clears all child layout metadata.
 - Layout data can affect both container attrs and immediate child attrs; validate behavior for both sides when changing cleanup or propagation.
 
+## Empty flex layouts
+
+- No children means no layout lines. Skip stretch-per-line division and
+  baseline placement when the line count is zero. Both row and column
+  layouts can become empty after component sync; resizing them must still
+  return valid layout data (F169).
+
 ## Grid assignment
 
 - Grid `assign-cells` ensures at least one column and row, skips absolute-position children, creates non-tracked rows/cols when children exceed tracked cells, and asserts that assigned cells do not overlap.
@@ -13,4 +20,4 @@
 - The `:reorder-children` change it emits is refused on parents inside component copies unless `allow-altering-copies` (same rule as `:mov-objects`); `pcb/reorder-grid-children` also skips copy grids producer-side. Copy child order is owned by the component sync engine.
 - Grid deassignment removes cells for shapes that are no longer direct children or have become absolute-positioned.
 - Auto-positioning is not just sorting: some auto cells are converted to manual when empty/manual/span state would break the auto sequence, then auto single-span items can be compacted.
-- `fix-overlaps` is marked dev-only and removes one overlapping cell, preferring empty cells first. Avoid depending on it as normal production repair.
\ No newline at end of file
+- `fix-overlaps` is marked dev-only and removes one overlapping cell, preferring empty cells first. Avoid depending on it as normal production repair.
diff --git a/common/src/app/common/geom/shapes/flex_layout/layout_data.cljc b/common/src/app/common/geom/shapes/flex_layout/layout_data.cljc
index da81f5b876..c960d4414d 100644
--- a/common/src/app/common/geom/shapes/flex_layout/layout_data.cljc
+++ b/common/src/app/common/geom/shapes/flex_layout/layout_data.cljc
@@ -224,12 +224,12 @@
 
             ;; When align-items is stretch we need to adjust the main axis size to grow for the full content
             stretch-width-fix
-            (if (and col? (ctl/content-stretch? parent) (not auto-width?))
+            (if (and (pos? num-lines) col? (ctl/content-stretch? parent) (not auto-width?))
               (/ (- layout-width (* layout-gap-col (dec num-lines)) total-max-width) num-lines)
               0)
 
             stretch-height-fix
-            (if (and row? (ctl/content-stretch? parent) (not auto-height?))
+            (if (and (pos? num-lines) row? (ctl/content-stretch? parent) (not auto-height?))
               (/ (- layout-height (* layout-gap-row (dec num-lines)) total-max-height) num-lines)
               0)
 
@@ -300,7 +300,8 @@
 
             [total-width total-height] (->> layout-lines (reduce add-lines [0 0]))
 
-            base-p (flp/get-base-line parent layout-bounds total-width total-height num-lines)]
+            base-p (when (pos? num-lines)
+                     (flp/get-base-line parent layout-bounds total-width total-height num-lines))]
 
         (->> layout-lines
              (reduce (partial add-starts total-width total-height num-lines) [(transient []) base-p])
diff --git a/common/test/common_tests/geom_flex_layout_test.cljc b/common/test/common_tests/geom_flex_layout_test.cljc
index 746b2cbef1..2746ead5ed 100644
--- a/common/test/common_tests/geom_flex_layout_test.cljc
+++ b/common/test/common_tests/geom_flex_layout_test.cljc
@@ -34,6 +34,16 @@
   [rect]
   (grc/rect->points rect))
 
+(t/deftest empty-wrapped-layout-has-no-lines
+  (doseq [direction [:row :column]
+          alignment [:stretch :space-around :space-evenly :space-between :center :end]]
+    (let [frame (make-col-frame :layout-flex-dir direction
+                                :layout-align-content alignment
+                                :layout-padding {:p1 0 :p2 0 :p3 0 :p4 0}
+                                :layout-padding-type :simple)
+          bounds (rect->bounds (grc/make-rect 0 0 200 200))]
+      (t/is (= [] (:layout-lines (fld/calc-layout-data frame bounds [] {} {})))))))
+
 ;; ---- get-base-line (around? branch) ----
 ;;
 ;; Bug: in positions.cljc the col? + around? branch had a mis-parenthesised