diff --git a/jedi/parser/fast.py b/jedi/parser/fast.py
index 055bfa39..70295c6a 100644
--- a/jedi/parser/fast.py
+++ b/jedi/parser/fast.py
@@ -58,9 +58,9 @@ def suite_or_file_input_is_valid(grammar, stack):
         return False
 
     for dfa, newstate, (symbol_number, nodes) in reversed(stack):
-        if symbol_number == grammar.symbol2number['suite']:
-            # If we don't have nodes already, the suite is not valid.
-            return bool(nodes)
+        if grammar.number2symbol[symbol_number] == 'suite':
+            # If only newline is in the suite, the suite is not valid, yet.
+            return len(nodes) > 1
     # Not reaching a suite means that we're dealing with file_input levels
     # where there's no need for a valid statement in it. It can also be empty.
     return True
diff --git a/test/test_parser/test_diff_parser.py b/test/test_parser/test_diff_parser.py
index 519d5b87..1b0002ca 100644
--- a/test/test_parser/test_diff_parser.py
+++ b/test/test_parser/test_diff_parser.py
@@ -200,7 +200,7 @@ def test_for_on_one_line(differ):
     """)
     # The second parser is for parsing the `def nested()` which is an `equal`
     # operation in the SequenceMatcher.
-    differ.parse(src, parsers=2, copies=1)
+    differ.parse(src, parsers=1, copies=1)
 
 
 def test_open_parentheses(differ):
@@ -208,7 +208,7 @@ def test_open_parentheses(differ):
     code = u('isinstance(\n\n' + func)
     differ.initialize(code)
 
-    differ.parse('isinstance(\n' + func, copies=1, parsers=1)
+    differ.parse('isinstance(\n' + func, parsers=1, allow_error_leafs=True)
 
 
 def test_backslash(differ):
@@ -238,4 +238,4 @@ def test_backslash(differ):
     def second():
         pass
     """)
-    differ.parse(src, parsers=2)
+    differ.parse(src, parsers=1)