DbDataSourceImpl.getModel fails because: parent is null

I'm using the DbDataSource API and sometimes after working with Intellij for while & I think it's only after

opening more then a single instance of Intellij an error raises when calling the checkValid on the dbElementImpl

The stacktrace I'm getting :

2019-01-23 17:50:43,150 [23149249] ERROR - on.DataSourceAccessorComponent - Element: class com.intellij.database.psi.DbDataSourceImpl because: parent is null
invalidated at: no info
com.intellij.psi.PsiInvalidElementAccessException: Element: class com.intellij.database.psi.DbDataSourceImpl because: parent is null
invalidated at: no info
at com.intellij.psi.util.PsiUtilCore.ensureValid(PsiUtilCore.java:502)
at com.intellij.database.psi.DbElementImpl.checkValid(DbElementImpl.java:397)
at com.intellij.database.psi.DbDataSourceImpl.getModel(DbDataSourceImpl.java:193)
at com.idi.intellij.plugin.query.annoref.connection.DataSourceAccessorComponent.initializeStoreProceduresMap(DataSourceAccessorComponent.java:369)
at com.idi.intellij.plugin.query.annoref.connection.DataSourceAccessorComponent.getSpNames(DataSourceAccessorComponent.java:382)
at com.idi.intellij.plugin.query.annoref.config.SPViewPanelForm.searchForStartAndEndIndices(SPViewPanelForm.java:288)
at com.idi.intellij.plugin.query.annoref.config.SPViewPanelForm.highLightSPExecText(SPViewPanelForm.java:240)
at com.idi.intellij.plugin.query.annoref.config.SPViewPanelForm.isTextSetForViewing(SPViewPanelForm.java:212)
at com.idi.intellij.plugin.query.annoref.component.SPViewContentStateManager.getSPViewContent(SPViewContentStateManager.java:172)
at com.idi.intellij.plugin.query.annoref.component.SPViewContentStateManager.fetchSpForContentDisplay(SPViewContentStateManager.java:155)
at com.idi.intellij.plugin.query.annoref.codeInsight.SPToolWindowDisplayHelper.displaySPInToolWindow(SPToolWindowDisplayHelper.java:61)
at com.idi.intellij.plugin.query.annoref.codeInsight.SPToolWindowDisplayHelper.displayStorageProcedureText(SPToolWindowDisplayHelper.java:51)
at com.idi.intellij.plugin.query.annoref.codeInsight.MyJavaDocumentationProvider.lambda$getQuickNavigateInfo$24(MyJavaDocumentationProvider.java:95)
at com.intellij.openapi.project.DumbServiceImpl.b(DumbServiceImpl.java:170)
at com.intellij.ide.startup.impl.StartupManagerImpl.a(StartupManagerImpl.java:396)
at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:315)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.a(LaterInvocator.java:424)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:407)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
at java.awt.EventQueue.access$500(EventQueue.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:715)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
at com.intellij.ide.IdeEventQueue.g(IdeEventQueue.java:822)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:650)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:366)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

which is called from - 

private void initializeStoreProceduresMap() {
   if (getDataSource() != null) {
      try {
         DatabaseSystem databaseSystem = getDataSource();
         databaseSystem.getModel().traverser()
               .expand(o -> o instanceof DasNamespace)
               .filter(DasRoutine.class)
               .map(DasObject::getName).toMap((Convertor<String, String>) s -> null);
         spNamesMap = Maps.newHashMapWithExpectedSize(getDataSource().getModel().getModelRoots().size());
      } catch (PsiInvalidElementAccessException e) {
         LOGGER.error(e);
      }
   }
}

Trying to get the DataSource with this code :

DbPsiFacade dataSourceManager = DbPsiFacade.getInstance(project);
Optional<DbDataSource> dbDataSource = dataSourceManager.getDataSources().stream().filter(dbDataSource1 -> dbDataSource1.getName().equals(selectDataSource)).findFirst();
if (!dbDataSource.isPresent()) {
   logger.error("initDataSource(): No DataSource with name=" + selectDataSource + " was found!");
   return false;
}
dataSource = dbDataSource.get();

The call I'm making is always from the main DispatchThread. 

Why is the Element is inValid on some occasions? 

Any help would be mostly appreciated.

Eldad.