Hello,

I have the same problem: ubuntu 18.10 64bit, libreoffice 6.1.4.2, zotero standalone 5.0.60 and
openjdk version "11.0.1" 2018-10-16
OpenJDK Runtime Environment (build 11.0.1+13-Ubuntu-3ubuntu3.18.10.1)
OpenJDK 64-Bit Server VM (build 11.0.1+13-Ubuntu-3ubuntu3.18.10.1, mixed mode, sharing)

When i try to integrate a new citation, i can select it but when i click OK, i get the "zotero integration error window":

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:331)
at org.zotero.integration.ooo.comp.ReferenceMark.compareTo(ReferenceMark.java:340)
at org.zotero.integration.ooo.comp.ReferenceMark.compareTo(ReferenceMark.java:1)
at java.base/java.util.ComparableTimSort.countRunAndMakeAscending(ComparableTimSort.java:320)
at java.base/java.util.ComparableTimSort.sort(ComparableTimSort.java:188)
at java.base/java.util.Arrays.sort(Arrays.java:1315)
at java.base/java.util.Arrays.sort(Arrays.java:1509)
at java.base/java.util.ArrayList.sort(ArrayList.java:1749)
at java.base/java.util.Collections.sort(Collections.java:143)
at org.zotero.integration.ooo.comp.Document.getFields(Document.java:447)
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.base/java.lang.Thread.run(Thread.java:834)

Could you help me solve this issue ?

Thanks,

Emmanuel.