DOAB fetcher throws exception when searching for "politik"

[Siedlerchr]

JabRef version

5.9 (latest release)

Operating system

macOS

Details on version and operating system

No response

Checked with the latest development build

• I made a backup of my libraries before testing the latest development version.
• I have tested the latest development version and the problem persists

Steps to reproduce the behaviour

1. Go to "web search"
2. Use "DOAB" fetcher
3. Search for the word "politik"

Wait. Eventually following error message with trigger:

	at [email protected]/kong.unirest.json.JSONObject.tryNumber(JSONObject.java:972)
	at [email protected]/kong.unirest.json.JSONObject.getInt(JSONObject.java:494)
	at [email protected]/org.jabref.logic.importer.fetcher.DOABFetcher.jsonToBibEntry(DOABFetcher.java:121)
	at [email protected]/org.jabref.logic.importer.fetcher.DOABFetcher.lambda$getParser$0(DOABFetcher.java:77)
	at [email protected]/org.jabref.logic.importer.SearchBasedParserFetcher.getBibEntries(SearchBasedParserFetcher.java:59)
	at [email protected]/org.jabref.logic.importer.SearchBasedParserFetcher.performSearch(SearchBasedParserFetcher.java:54)
	at [email protected]/org.jabref.logic.importer.SearchBasedFetcher.performSearch(SearchBasedFetcher.java:51)
	at [email protected]/org.jabref.gui.importer.fetcher.WebSearchPaneViewModel.lambda$search$3(WebSearchPaneViewModel.java:137)
	at [email protected]/org.jabref.gui.util.BackgroundTask$1.call(BackgroundTask.java:60)
	at [email protected]/org.jabref.gui.util.DefaultTaskExecutor$1.call(DefaultTaskExecutor.java:161)
	at javafx.graphics@19/javafx.concurrent.Task$TaskCallable.call(Task.java:1426)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:577)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1589)

Appendix

Originally created at https://github.com/JabRef/jabref-issue-melting-pot/issues/75
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