From crash report:

USER_COMMENT=Trying to display an image.
ANDROID_VERSION=4.1.2
APP_VERSION_NAME=1.0
BRAND=samsung
PHONE_MODEL=GT-I9300
CUSTOM_DATA=
STACK_TRACE=java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.StringIndexOutOfBoundsException: length=0; regionStart=0; regionLength=1
at java.lang.String.startEndAndLength(String.java:593)
at java.lang.String.substring(String.java:1474)
at org.wikimedia.commons.Utils.capitalize(Utils.java:145)
at org.wikimedia.commons.MediaDataExtractor$1.match(MediaDataExtractor.java:193)
at org.wikimedia.commons.MediaDataExtractor.findTemplateParameter(MediaDataExtractor.java:224)
at org.wikimedia.commons.MediaDataExtractor.findTemplateParameter(MediaDataExtractor.java:190)
at org.wikimedia.commons.MediaDataExtractor.processWikiParseTree(MediaDataExtractor.java:116)
at org.wikimedia.commons.MediaDataExtractor.processResult(MediaDataExtractor.java:84)
at org.wikimedia.commons.MediaDataExtractor.fetch(MediaDataExtractor.java:71)
at org.wikimedia.commons.media.MediaDetailFragment$4.doInBackground(MediaDetailFragment.java:194)
at org.wikimedia.commons.media.MediaDetailFragment$4.doInBackground(MediaDetailFragment.java:183)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
... 4 more
java.lang.StringIndexOutOfBoundsException: length=0; regionStart=0; regionLength=1
at java.lang.String.startEndAndLength(String.java:593)
at java.lang.String.substring(String.java:1474)
at org.wikimedia.commons.Utils.capitalize(Utils.java:145)
at org.wikimedia.commons.MediaDataExtractor$1.match(MediaDataExtractor.java:193)
at org.wikimedia.commons.MediaDataExtractor.findTemplateParameter(MediaDataExtractor.java:224)
at org.wikimedia.commons.MediaDataExtractor.findTemplateParameter(MediaDataExtractor.java:190)
at org.wikimedia.commons.MediaDataExtractor.processWikiParseTree(MediaDataExtractor.java:116)
at org.wikimedia.commons.MediaDataExtractor.processResult(MediaDataExtractor.java:84)
at org.wikimedia.commons.MediaDataExtractor.fetch(MediaDataExtractor.java:71)
at org.wikimedia.commons.media.MediaDetailFragment$4.doInBackground(MediaDetailFragment.java:194)
at org.wikimedia.commons.media.MediaDetailFragment$4.doInBackground(MediaDetailFragment.java:183)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)

Version: unspecified
Severity: critical