Tooltip issue in BeforeDestroy hook

Hello Mickaël, you did a great job, but I still have an issue similar to #195.

[Vue warn]: Error in beforeDestroy hook: "TypeError: this._map is null" found in <LTooltip> <LMarker> <LLayerGroup> <LMap>

TypeError: "this._map is null" removeInteractiveTarget leaflet-src.js:6460 closeTooltip leaflet-src.js:10292 unbindTooltip leaflet-src.js:10215 beforeDestroy vue2-leaflet.min.js:1 invokeWithErrorHandling21VueJS

invokeWithErrorHandling callHook destroy destroy invokeDestroyHook invokeDestroyHook patch destroy destroy invokeDestroyHook removeVnodes updateChildren patchVnode patch _update updateComponent get run flushSchedulerQueue nextTick flushCallbacks

I got this error when my data changes or when map is destroyed. I have v-if condition for <l-marker>. The code looks like:

        <l-layer-group
          v-if="stops != null && stops.Fwd !== null"
          layer-type="overlay"
          name="Bus stops"
        >
          <l-marker
            v-for="item in fwdStops"
            :key="item.Key"
            :lat-lng="item.Pos"
            :icon="$iconStopFwd"
          >
            <l-popup>№: {{item.Num}} - {{item.Name}}</l-popup>
            <l-tooltip :options="{permanent: true, interactive: true}">{{item.Num}}</l-tooltip>
          </l-marker>
        </l-layer-group>

I have several maps in my app and all have same bug.

Browsers Affected

• Chrome
• Firefox
• Edge
• Safari 9
• Safari 8
• IE 11

Versions

• Leaflet: v1.4.0
• Vue: v2.6.10
• Vue2Leaflet: v2.0.2