Uncaught TypeError: Cannot read property 'get' of undefined

[jmsobe]

Getting occasional JS error using URL params regarding the Current Marker Id. Uncaught TypeError: Cannot read property 'get' of undefined. Any ideas why this is occurring?
In this case there is one record being returned by the result

	` * @param currentMarker {Object} Google Maps marker
	 * @param storeStart {number} optional first location on the current page
	 * @param page {number} optional current page
	 *
	 * @returns {Object} extended location data object
	 */
	_defineLocationData: function (currentMarker, storeStart, page) {
		this.writeDebug('_defineLocationData',arguments);
		var indicator = '';
		this._createLocationVariables(currentMarker.get('id'));`