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-rw-r--r--src/mbgl/util/tile_cover.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mbgl/util/tile_cover.cpp b/src/mbgl/util/tile_cover.cpp
index 7699739588..b53e91162c 100644
--- a/src/mbgl/util/tile_cover.cpp
+++ b/src/mbgl/util/tile_cover.cpp
@@ -156,6 +156,8 @@ std::vector<UnwrappedTileID> tileCover(const LatLngBounds& bounds_, int32_t z) {
}
std::vector<UnwrappedTileID> tileCover(const TransformState& state, int32_t z) {
+ assert(state.valid());
+
const double w = state.getSize().width;
const double h = state.getSize().height;
return tileCover(