From 89c38991b997be66ffb7f205099e20a916bd1e2c Mon Sep 17 00:00:00 2001
From: orangemug <info@orangemug.co.uk>
Date: Mon, 29 Jan 2018 17:17:55 +0000
Subject: [PATCH] Added guard to <LayerSourceLayerBlock/> sourceLayerIds

---
 src/components/layers/LayerEditor.jsx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/components/layers/LayerEditor.jsx b/src/components/layers/LayerEditor.jsx
index 1d43bff..47ebe20 100644
--- a/src/components/layers/LayerEditor.jsx
+++ b/src/components/layers/LayerEditor.jsx
@@ -117,6 +117,11 @@ export default class LayerEditor extends React.Component {
       comment = this.props.layer.metadata['maputnik:comment']
     }
 
+    let sourceLayerIds;
+    if(this.props.sources.hasOwnProperty(this.props.layer.source)) {
+      sourceLayerIds = this.props.sources[this.props.layer.source].layers;
+    }
+
     switch(type) {
       case 'layer': return <div>
         <LayerIdBlock
@@ -134,7 +139,7 @@ export default class LayerEditor extends React.Component {
         />
         }
         {this.props.layer.type !== 'raster' && this.props.layer.type !== 'background' && <LayerSourceLayerBlock
-          sourceLayerIds={this.props.sources[this.props.layer.source].layers}
+          sourceLayerIds={sourceLayerIds}
           value={this.props.layer['source-layer']}
           onChange={v => this.changeProperty(null, 'source-layer', v)}
         />