An error occurred communicating with Zotero

Hello I have a big problem. Everytime I try to add citations to LibreOffice I get the error message above.
Nothing really changed on my system...
Error seems only to appear in this document, but it would be very complecated to set up a complete new one.

Hope someone can help me fast, I have to write an abstract for university ;)

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Here the detail information:

An error occurred communicating with Zotero:
java.lang.NullPointerException
at org.zotero.integration.ooo.comp.TextTableManager.(TextTableManager.java:64)
at org.zotero.integration.ooo.comp.ReferenceMark.getDocumentRange(ReferenceMark.java:347)
at org.zotero.integration.ooo.comp.ReferenceMark.compareTo(ReferenceMark.java:357)
at org.zotero.integration.ooo.comp.ReferenceMark.compareTo(ReferenceMark.java:1)
at java.util.ComparableTimSort.countRunAndMakeAscending(ComparableTimSort.java:320)
at java.util.ComparableTimSort.sort(ComparableTimSort.java:188)
at java.util.Arrays.sort(Arrays.java:1312)
at java.util.Arrays.sort(Arrays.java:1506)
at java.util.ArrayList.sort(ArrayList.java:1462)
at java.util.Collections.sort(Collections.java:141)
at org.zotero.integration.ooo.comp.Document.getFields(Document.java:404)
at org.zotero.integration.ooo.comp.CommMessage.execute(CommMessage.java:107)
at org.zotero.integration.ooo.comp.CommMessage.getBytes(CommMessage.java:61)
at org.zotero.integration.ooo.comp.CommServer.run(CommServer.java:84)
at java.lang.Thread.run(Thread.java:748)

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And from console:

Possibly unhandled rejection:

err is null

TypeError: err is null
logError@chrome://zotero/content/xpcom/zotero.js:1300:3
execCommand@chrome://zotero/content/xpcom/integration.js:276:7
From previous event:
Comm</DataListener.prototype._transactionCallbacks[0]<@file:///usr/lib/zotero/extensions/zoteroOpenOfficeIntegration@zotero.org/components/zoteroOpenOfficeIntegration.js:168:6
Comm</DataListener.prototype._processFrame/<@file:///usr/lib/zotero/extensions/zoteroOpenOfficeIntegration@zotero.org/components/zoteroOpenOfficeIntegration.js:273:7
this.setTimeout/timerCallback.notify@chrome://zotero/content/xpcom/zotero.js:1780:5
Possibly unhandled rejection:
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