diff --git a/src/ytdl_sub/script/parser.py b/src/ytdl_sub/script/parser.py
index d316a3fd..86ea1e2e 100644
--- a/src/ytdl_sub/script/parser.py
+++ b/src/ytdl_sub/script/parser.py
@@ -10,6 +10,7 @@ from ytdl_sub.script.types.map import UnresolvedMap
 from ytdl_sub.script.types.resolvable import Boolean
 from ytdl_sub.script.types.resolvable import Float
 from ytdl_sub.script.types.resolvable import Integer
+from ytdl_sub.script.types.resolvable import NonHashable
 from ytdl_sub.script.types.resolvable import String
 from ytdl_sub.script.types.syntax_tree import SyntaxTree
 from ytdl_sub.script.types.variable import FunctionArgument
@@ -27,6 +28,9 @@ MAP_KEY_MULTIPLE_VALUES = InvalidSyntaxException(
     "Map key has multiple values when there should only be one"
 )
 MAP_MISSING_KEY = InvalidSyntaxException("Map has a missing key")
+MAP_KEY_NOT_HASHABLE = InvalidSyntaxException(
+    "Map key must be a hashable type (Integer, Float, Boolean, String)"
+)
 
 
 class _Parser:
@@ -283,6 +287,8 @@ class _Parser:
                     raise MAP_KEY_WITH_NO_VALUE
                 if len(value_args) > 1:
                     raise StringFormattingException("map has key with multiple values")
+                if isinstance(key, NonHashable):
+                    raise MAP_KEY_NOT_HASHABLE
 
                 output[key] = value_args[0]
                 key = None
diff --git a/src/ytdl_sub/script/types/array.py b/src/ytdl_sub/script/types/array.py
index 47dfb48d..3f7e1343 100644
--- a/src/ytdl_sub/script/types/array.py
+++ b/src/ytdl_sub/script/types/array.py
@@ -4,6 +4,7 @@ from typing import List
 from typing import Set
 
 from ytdl_sub.script.types.resolvable import ArgumentType
+from ytdl_sub.script.types.resolvable import NonHashable
 from ytdl_sub.script.types.resolvable import Resolvable
 from ytdl_sub.script.types.variable import FunctionArgument
 from ytdl_sub.script.types.variable import Variable
@@ -11,7 +12,7 @@ from ytdl_sub.script.types.variable_dependency import VariableDependency
 
 
 @dataclass(frozen=True)
-class Array:
+class Array(NonHashable):
     value: List[Resolvable]
 
     def __str__(self):
diff --git a/src/ytdl_sub/script/types/map.py b/src/ytdl_sub/script/types/map.py
index 30f6ec26..2920104b 100644
--- a/src/ytdl_sub/script/types/map.py
+++ b/src/ytdl_sub/script/types/map.py
@@ -6,6 +6,7 @@ from typing import Set
 
 from ytdl_sub.script.types.resolvable import ArgumentType
 from ytdl_sub.script.types.resolvable import Hashable
+from ytdl_sub.script.types.resolvable import NonHashable
 from ytdl_sub.script.types.resolvable import Resolvable
 from ytdl_sub.script.types.variable import FunctionArgument
 from ytdl_sub.script.types.variable import Variable
@@ -14,7 +15,7 @@ from ytdl_sub.utils.exceptions import StringFormattingException
 
 
 @dataclass(frozen=True)
-class Map:
+class Map(NonHashable):
     value: Dict[Hashable, Resolvable]
 
     def to_native(self) -> Dict:
diff --git a/src/ytdl_sub/script/types/resolvable.py b/src/ytdl_sub/script/types/resolvable.py
index 71e318dd..a5e548cd 100644
--- a/src/ytdl_sub/script/types/resolvable.py
+++ b/src/ytdl_sub/script/types/resolvable.py
@@ -36,6 +36,10 @@ class Hashable(Resolvable, ABC):
     pass
 
 
+class NonHashable(ABC):
+    pass
+
+
 @dataclass(frozen=True)
 class ResolvableT(Hashable, ABC, Generic[T]):
     value: T
diff --git a/tests/unit/script/types/test_map.py b/tests/unit/script/types/test_map.py
index e75eb703..efedf6b0 100644
--- a/tests/unit/script/types/test_map.py
+++ b/tests/unit/script/types/test_map.py
@@ -3,6 +3,7 @@ import re
 import pytest
 
 from ytdl_sub.script.parser import MAP_KEY_MULTIPLE_VALUES
+from ytdl_sub.script.parser import MAP_KEY_NOT_HASHABLE
 from ytdl_sub.script.parser import MAP_KEY_WITH_NO_VALUE
 from ytdl_sub.script.parser import MAP_MISSING_KEY
 from ytdl_sub.script.parser import UNEXPECTED_ARGUMENT
@@ -124,3 +125,16 @@ class TestMap:
     def test_map_missing_key(self, value: str):
         with pytest.raises(InvalidSyntaxException, match=re.escape(str(MAP_MISSING_KEY))):
             Script({"map": value}).resolve()
+
+    @pytest.mark.parametrize(
+        "value",
+        [
+            "{{{}:'value'}}",
+            "{{ {} : 'value' }}",
+            "{{[]:'value'}}",
+            "{{ [] : 'value' }}",
+        ],
+    )
+    def test_map_key_not_hashable(self, value: str):
+        with pytest.raises(InvalidSyntaxException, match=re.escape(str(MAP_KEY_NOT_HASHABLE))):
+            Script({"map": value}).resolve()