TypeError: Cannot read properties of null (reading 'toString')

[damianoazzolini]

Hi,
I've noticed that in the output tab of Log (remote Extension Host) I keep getting the following error.

[2022-04-28 10:00:37.295] [exthost] [error] [arthurwang.vsc-prolog] provider FAILED
[2022-04-28 10:00:37.296] [exthost] [error] TypeError: Cannot read properties of null (reading 'toString')
	at Function.execPrologSync (/home/damiano/.vscode-server/extensions/arthurwang.vsc-prolog-0.8.23/out/src/utils/utils.js:283:71)
	at Function.getPredicateUnderCursor (/home/damiano/.vscode-server/extensions/arthurwang.vsc-prolog-0.8.23/out/src/utils/utils.js:166:37)
	at PrologHoverProvider.provideHover (/home/damiano/.vscode-server/extensions/arthurwang.vsc-prolog-0.8.23/out/src/features/hoverProvider.js:16:34)
	at c.provideHover (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:85:98679)
	at /home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:85:126291
	at Q._withAdapter (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:85:123102)
	at Q.$provideHover (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:85:126267)
	at i._doInvokeHandler (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:89:13826)
	at i._invokeHandler (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:89:13510)
	at i._receiveRequest (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:89:12119)
	at i._receiveOneMessage (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:89:10841)
	at /home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:89:8947
	at u.invoke (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:58:145)
	at v.fire (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:58:1856)
	at d.fire (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:66:19034)
	at /home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:104:34275
	at u.invoke (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:58:145)
	at v.fire (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:58:1856)
	at d.fire (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:66:19034)
	at o._receiveMessage (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:66:23615)
	at /home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:66:21149
	at u.invoke (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:58:145)
	at v.fire (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:58:1856)
	at v.acceptChunk (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:66:15865)
	at /home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:66:14995
	at u.invoke (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:58:145)
	at v.fire (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:58:1856)
	at l._processReadQueue (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:104:21305)
	at l.acceptFrame (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:104:20961)
	at E._acceptChunk (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:104:18925)
	at /home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:104:15914
	at Socket.T (/home/damiano/.vscode-server/bin/dfd34e8260c270da74b5c2d86d61aee4b6d56977/out/vs/workbench/api/node/extensionHostProcess.js:104:13797)
	at Socket.emit (node:events:390:28)
	at addChunk (node:internal/streams/readable:315:12)
	at readableAddChunk (node:internal/streams/readable:289:9)
	at Socket.Readable.push (node:internal/streams/readable:228:10)
	at TCP.onStreamRead (node:internal/stream_base_commons:199:23)