diff --git a/antlr_ast/ast.py b/antlr_ast/ast.py
index 2905c8e..68b74a4 100644
--- a/antlr_ast/ast.py
+++ b/antlr_ast/ast.py
@@ -311,12 +311,21 @@ def get_text(self, full_text=None):
     def get_position(self):
         ctx = self._ctx
         if ctx is not None:
-            position = {
-                "line_start": ctx.start.line,
-                "column_start": ctx.start.column,
-                "line_end": ctx.stop.line,
-                "column_end": ctx.stop.column + (ctx.stop.stop - ctx.stop.start),
-            }
+            if hasattr(ctx, "symbol"):
+                position = {
+                    "line_start": ctx.symbol.line,
+                    "column_start": ctx.symbol.column,
+                    "line_end": ctx.symbol.line,
+                    "column_end": ctx.symbol.column + (ctx.symbol.stop - ctx.symbol.start),
+                }
+            else:
+                position = {
+                    "line_start": ctx.start.line,
+                    "column_start": ctx.start.column,
+                    "line_end": ctx.stop.line,
+                    "column_end": ctx.stop.column + (ctx.stop.stop - ctx.stop.start),
+                }
+
         else:
             position = self.position
         return position
@@ -337,7 +346,7 @@ class Terminal(BaseNode):
     """
 
     _fields = tuple(["value"])
-    DEBUG = False
+    DEBUG = True
     DEBUG_INSTANCES = []
 
     def __new__(cls, *args, **kwargs):
@@ -468,7 +477,8 @@ def visit(self, node):
             if isinstance(alias, AliasNode) or alias == node:
                 # this prevents infinite recursion and visiting
                 # AliasNodes with a name that is also the name of a BaseNode
-                self.generic_visit(alias)
+                if isinstance(alias, BaseNode):
+                    self.generic_visit(alias)
             else:
                 # visit BaseNode (e.g. result of Transformer method)
                 if isinstance(alias, list):
diff --git a/tests/test_expr_ast.py b/tests/test_expr_ast.py
index 76f0d20..87971b5 100644
--- a/tests/test_expr_ast.py
+++ b/tests/test_expr_ast.py
@@ -4,6 +4,7 @@
     parse as parse_ast,
     process_tree,
     BaseNodeTransformer,
+    Terminal,
 )
 
 from . import grammar
@@ -31,9 +32,6 @@ def visit_SubExpr(self, node):
     def visit_NotExpr(self, node):
         return NotExpr.from_spec(node)
 
-    def visit_Terminal(self, node):
-        return node.get_text()
-
 
 def parse(text, start="expr", **kwargs):
     antlr_tree = parse_ast(grammar, text, start, upper=False, **kwargs)
@@ -60,6 +58,7 @@ def test_subexpr():
     node = parse("(1 + 1)")
     assert isinstance(node, SubExpr)
     assert isinstance(node.expression, BinaryExpr)
+    assert isinstance(node.expression.left, Terminal)
 
 
 def test_fields():
@@ -103,3 +102,48 @@ def test_speaker_node_cfg():
     assert speaker.describe(node, str_tmp, "left") == str_tmp.format(
         field_name="left part", node_name="binary expression"
     )
+
+
+# BaseNode.get_position -------------------------------------------------------
+
+
+def test_get_position():
+    # Given
+    code = "1 + (2 + 2)"
+    correct_position = {
+        "line_start": 1,
+        "column_start": 4,
+        "line_end": 1,
+        "column_end": 10,
+    }
+
+    # When
+    result = parse(code)
+    positions = result.right.get_position()
+
+    # Then
+    assert positions["line_start"] == correct_position["line_start"]
+    assert positions["line_end"] == correct_position["line_end"]
+    assert positions["column_start"] == correct_position["column_start"]
+    assert positions["column_end"] == correct_position["column_end"]
+
+
+def test_terminal_get_position():
+    # Given
+    code = "(2 + 2) + 1"
+    correct_position = {
+        "line_start": 1,
+        "column_start": 10,
+        "line_end": 1,
+        "column_end": 10,
+    }
+
+    # When
+    result = parse(code)
+    positions = result.right.get_position()
+
+    # Then
+    assert positions["line_start"] == correct_position["line_start"]
+    assert positions["line_end"] == correct_position["line_end"]
+    assert positions["column_start"] == correct_position["column_start"]
+    assert positions["column_end"] == correct_position["column_end"]