This query return an error :
SELECT ?item WHERE { ?item wdt:P1082 +0. ?item wdt:P17 wd:Q142. }
The error :
Query is malformed: Encountered " <VAR1> "?item "" at line 3, column 3.
The issue is only about the string "+0" in a SPARQL query because an query with "[]" works:
SELECT ?item WHERE { ?item wdt:P1082 []. ?item wdt:P17 wd:Q142. } LIMIT 10
This query don't return Q3593337 as result, but don't return an error.
SELECT ?item ?label ?_image WHERE { ?item wdt:P1082 +0; wdt:P17 wd:Q142. } LIMIT 100
Maybe this case is an other bug