fix #4912

src/layouts.jl

@@ -216,23 +216,28 @@ function GridLayout(
     kw...,
 )
     # Check the values for heights and widths if values are provided
-    if heights !== nothing && widths !== nothing
+    if heights !== nothing
         if sum(heights) != 1
             error("The sum of heights must be 1!")
         end
+        if all(x -> 0 < x < 1, heights) == false
+            error("Values for heights must be in the range (0, 1)!")
+        end
+    else
+        heights = zeros(dims[1])
+    end
+    if widths !== nothing
+
         if sum(widths) != 1
             error("The sum of widths must be 1!")
         end
         if all(x -> 0 < x < 1, widths) == false
             error("Values for widths must be in the range (0, 1)!")
         end
-        if all(x -> 0 < x < 1, heights) == false
-            error("Values for heights must be in the range (0, 1)!")
-        end
     else
-        heights = zeros(dims[1])
         widths = zeros(dims[2])
     end
+
     grid = Matrix{AbstractLayout}(undef, dims...)
     layout = GridLayout(
         parent,