Error when clearing a FeatureCollection

[geographika]

I'm getting an occasional error when clearing a features collection using mySource.getFeaturesCollection().clear();

The following GeoExt code calls this.findBy:

geoext/src/data/store/Features.js

Lines 215 to 219 in e2cd3d3

	onOlCollectionRemove: function(evt) {
	var element = evt.element;
	var idx = this.findBy(function(rec) {
	return rec.olObject === element;
	});

Then in Ext.data.AbstractStore this.getData() returns null resulting in TypeError: Cannot read properties of null (reading 'findIndexBy')

    findBy: function(fn, scope, start) {
        return this.getData().findIndexBy(fn, scope, start);
    },

The simple fix is to add a check to onOlCollectionRemove to exit if this.getData() is null, however I'll try to see why null is returned.