fixed export of media

1 files changed, 4 insertions, 4 deletions

diff --git a/src/fields/Doc.ts b/src/fields/Doc.ts
index 27da65342..7170be6cc 100644
--- a/src/fields/Doc.ts
+++ b/src/fields/Doc.ts
@@ -855,20 +855,20 @@ export namespace Doc {
         const proms = new Set<string>();
         function replacer(key: any, value: any) {            
             if (key && ['branchOf', 'cloneOf', 'cursors'].includes(key)) return undefined;
-            if (value.__type  === 'image') {
+            if (value?.__type  === 'image') {
                 const extension = value.url.replace(/.*\./, '');
                 proms.add(value.url.replace('.' + extension, '_o.' + extension));
                 return SerializationHelper.Serialize(new ImageField(value.url));
             }
-            if (value.__type  === 'pdf') {
+            if (value?.__type  === 'pdf') {
                 proms.add(value.url);
                 return SerializationHelper.Serialize(new PdfField(value.url));
             }
-            if (value.__type  === 'audio') {
+            if (value?.__type  === 'audio') {
                 proms.add(value.url);
                 return SerializationHelper.Serialize(new AudioField(value.url));
             }
-            if (value.__type  === 'video') {
+            if (value?.__type  === 'video') {
                 proms.add(value.url);
                 return SerializationHelper.Serialize(new VideoField(value.url));
             }