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@@ -174,7 +174,7 @@
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else if (self.oneDriveFile.isVideo) {
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self.thumbnailView.image = [UIImage imageNamed:@"movie"];
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NSString *thumbnailURL = _oneDriveFile.thumbnailURL;
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- if (thumbnailURL != NULL) {
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+ if ([thumbnailURL isKindOfClass:[NSString class]]) {
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if (thumbnailURL.length > 0) {
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_iconURL = [NSURL URLWithString:thumbnailURL];
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[self performSelectorInBackground:@selector(_updateIconFromURL) withObject:@""];
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