diff --git a/jedi/api.py b/jedi/api.py
index 739bbabd..5573cddb 100644
--- a/jedi/api.py
+++ b/jedi/api.py
@@ -65,7 +65,13 @@ class Script(object):
             lines.append('')
 
         self._line = max(len(lines), 1) if line is None else line
-        self._column = len(lines[-1]) if column is None else column
+        if not (0 < self._line <= len(lines)):
+            raise ValueError('`line` parameter is not in a valid range.')
+
+        line_len = len(lines[self._line - 1])
+        self._column = line_len if column is None else column
+        if not (0 <= self._column <= line_len):
+            raise ValueError('`column` parameter is not in a valid range.')
 
         api_classes._clear_caches()
         debug.reset_time()
diff --git a/test/test_api.py b/test/test_api.py
index 4ee7db3c..66e2c5ff 100644
--- a/test/test_api.py
+++ b/test/test_api.py
@@ -50,4 +50,4 @@ def test_line_number_errors():
 
     # ok
     api.Script(s, 1, 0)
-    api.Script(s, 1, len(s) + 1)
+    api.Script(s, 1, len(s))