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@@ -222,10 +222,12 @@ export default class Mapper {
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const names = this._elementToMarkerNames.get( element );
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- names.delete( name );
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+ if ( names ) {
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+ names.delete( name );
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- if ( names.size == 0 ) {
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- this._elementToMarkerNames.delete( element );
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+ if ( names.size == 0 ) {
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+ this._elementToMarkerNames.delete( element );
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+ }
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}
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}
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