Yapf-jetbrains gives an error on pycharm2019.2

[madpudding]

Hello, first of all, thank you for creating this plugin for jetbrians, which brings me great convenience. yapf-jetbrains reported an error on pycharm2019.2, it seems that this plugin can not run on the new version of pycharm, this is the error message:
java.lang.NullPointerException at me.chaerim.yapf.Document.$anonfun$findConfigFile$4(Document.scala:37) at scala.Option.map(Option.scala:146) at me.chaerim.yapf.Document.$anonfun$findConfigFile$2(Document.scala:37) at scala.collection.immutable.List.flatMap(List.scala:335) at me.chaerim.yapf.Document.findConfigFile(Document.scala:36) at me.chaerim.yapf.Document.$anonfun$format$1(Document.scala:47) at scala.util.Either.flatMap(Either.scala:338) at me.chaerim.yapf.Document.format(Document.scala:46) at me.chaerim.yapf.FormatAction.$anonfun$actionPerformed$2(FormatAction.scala:11) at me.chaerim.yapf.FormatAction.$anonfun$actionPerformed$2$adapted(FormatAction.scala:10) at scala.Option.map(Option.scala:146) at me.chaerim.yapf.FormatAction.$anonfun$actionPerformed$1(FormatAction.scala:10) at scala.Option.flatMap(Option.scala:171) at me.chaerim.yapf.FormatAction.actionPerformed(FormatAction.scala:9) at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:265) at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:282) at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$0(ActionMenuItem.java:292) at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:265) at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:107) at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:282) at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967) at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$0(ActionMenuItem.java:111) at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:82) at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:106) at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:115) at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:121) at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:111) at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:524) at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:35) at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:546) at java.desktop/java.awt.Component.processMouseEvent(Component.java:6651) at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342) at java.desktop/java.awt.Component.processEvent(Component.java:6416) at java.desktop/java.awt.Container.processEvent(Container.java:2263) at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5026) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4858) at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918) at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547) at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307) at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2773) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4858) at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:778) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:751) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:749) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:748) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:824) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:769) at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:412) at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:704) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:411) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)