Unable to serialize FindRecents state: Collection FieldAccessor[class com.intellij.find.impl.FindSettingsImpl$FindRecents.replaceStrings] contains 'null' object

I keep getting these IDE internal errors: Unable to serialize FindRecents state: Collection FieldAccessor[class com.intellij.find.impl.FindSettingsImpl$FindRecents.replaceStrings] contains 'null' object

Version: 141.2.2

Stacktrace:
Unable to serialize FindRecents state: Collection FieldAccessor[class com.intellij.find.impl.FindSettingsImpl$FindRecents.replaceStrings] contains 'null' object
com.intellij.util.xmlb.XmlSerializationException: Collection FieldAccessor[class com.intellij.find.impl.FindSettingsImpl$FindRecents.replaceStrings] contains 'null' object
 at com.intellij.util.xmlb.AbstractCollectionBinding.serializeItem(AbstractCollectionBinding.java:169)
 at com.intellij.util.xmlb.AbstractCollectionBinding.serialize(AbstractCollectionBinding.java:116)
 at com.intellij.util.xmlb.TagBinding.serialize(TagBinding.java:52)
 at com.intellij.util.xmlb.BeanBinding.serializeInto(BeanBinding.java:112)
 at com.intellij.util.xmlb.BeanBinding.serialize(BeanBinding.java:80)
 at com.intellij.util.xmlb.XmlSerializerImpl.serializeIfNotDefault(XmlSerializerImpl.java:88)
 at com.intellij.util.xmlb.XmlSerializer.serializeIfNotDefault(XmlSerializer.java:56)
 at com.intellij.openapi.components.impl.stores.SaveSessionBase.setState(SaveSessionBase.java:47)
 at com.intellij.openapi.components.impl.stores.StateStorageManagerImpl$StateStorageManagerExternalizationSession.setState(StateStorageManagerImpl.java:307)
 at com.intellij.openapi.components.impl.stores.ComponentStoreImpl.a(ComponentStoreImpl.java:195)
 at com.intellij.openapi.components.impl.stores.ComponentStoreImpl.a(ComponentStoreImpl.java:166)
 at com.intellij.openapi.components.impl.stores.ComponentStoreImpl.save(ComponentStoreImpl.java:99)
 at com.intellij.openapi.components.impl.stores.StoreUtil.save(StoreUtil.java:49)
 at com.intellij.openapi.application.impl.ApplicationImpl.saveSettings(ApplicationImpl.java:1361)
 at com.intellij.ide.SaveAndSyncHandlerImpl.saveProjectsAndDocuments(SaveAndSyncHandlerImpl.java:155)
 at com.intellij.ide.SaveAndSyncHandlerImpl$4.onFrameDeactivated(SaveAndSyncHandlerImpl.java:106)
 at com.intellij.ide.FrameStateManagerImpl.a(FrameStateManagerImpl.java:87)
 at com.intellij.ide.FrameStateManagerImpl.access$500(FrameStateManagerImpl.java:32)
 at com.intellij.ide.FrameStateManagerImpl$2$1.run(FrameStateManagerImpl.java:72)
 at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
 at com.intellij.util.Alarm$Request$1.run(Alarm.java:351)
 at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:332)
 at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:715)
 at java.awt.EventQueue.access$400(EventQueue.java:82)
 at java.awt.EventQueue$2.run(EventQueue.java:676)
 at java.awt.EventQueue$2.run(EventQueue.java:674)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:685)
 at com.intellij.ide.IdeEventQueue.e(IdeEventQueue.java:734)
 at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:569)
 at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:382)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)