Index: lams_tool_images/web/pages/learning/learning.jsp
===================================================================
diff -u -r9b6e8f63ef8d042b45139ea3df3d65bcd6eaa222 -r5c8a2e0886a1a782abc3d1b1d0be9f7b91c2aabd
--- lams_tool_images/web/pages/learning/learning.jsp	(.../learning.jsp)	(revision 9b6e8f63ef8d042b45139ea3df3d65bcd6eaa222)
+++ lams_tool_images/web/pages/learning/learning.jsp	(.../learning.jsp)	(revision 5c8a2e0886a1a782abc3d1b1d0be9f7b91c2aabd)
@@ -19,7 +19,7 @@
 	<c:set var="imageGallery" value="${sessionMap.imageGallery}" />
 	<c:set var="finishedLock" value="${sessionMap.finishedLock}" />
 	<c:set var="mediumImageDimensions" value="${sessionMap.mediumImageDimensions}" />
-	<c:set var="thumbnailImageDimensions" value="${sessionMap.thumbnailImageDimensions}" />
+	<c:set var="thumbnailImageDimensions" value="${empty sessionMap.thumbnailImageDimensions ? 100 : sessionMap.thumbnailImageDimensions}" />
 	<c:set var="windowMinimumWidth" value="${thumbnailImageDimensions*5 + 160}" />
 	<c:if test="${imageGallery.allowShareImages && (mode != 'teacher')}">
 		<c:set var="windowMinimumWidth" value="${windowMinimumWidth + 120}" />