diff --git a/docs/changelog.md b/docs/changelog.md
index 1be17bc6..cc835c55 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## v0.67.3
+
+### Fixed
+
+- Fixed a crash when parsing `vector()` calls with non-number arguments.
+
 ## v0.67.2
 
 ### Fixed
diff --git a/internal/parser/utils/source.go b/internal/parser/utils/source.go
index c5153459..0c0c0a68 100644
--- a/internal/parser/utils/source.go
+++ b/internal/parser/utils/source.go
@@ -514,7 +514,9 @@ If you're hoping to get instance specific labels this way and alert when some ta
 		s.GuaranteedLabels = nil
 		s.FixedLabels = true
 		s.AlwaysReturns = true
-		s.ReturnedNumbers = append(s.ReturnedNumbers, n.Args[0].(*promParser.NumberLiteral).Val)
+		if v, ok := n.Args[0].(*promParser.NumberLiteral); ok {
+			s.ReturnedNumbers = append(s.ReturnedNumbers, v.Val)
+		}
 		s.ExcludeReason = setInMap(
 			s.ExcludeReason,
 			"",
diff --git a/internal/parser/utils/source_test.go b/internal/parser/utils/source_test.go
index 0a1b94c4..5564128a 100644
--- a/internal/parser/utils/source_test.go
+++ b/internal/parser/utils/source_test.go
@@ -2103,6 +2103,109 @@ sum(foo:count) by(job) > 20`,
 				},
 			},
 		},
+		{
+			expr: "vector(scalar(foo))",
+			output: []utils.Source{
+				{
+					Type:          utils.FuncSource,
+					Returns:       promParser.ValueTypeVector,
+					Operation:     "vector",
+					FixedLabels:   true,
+					AlwaysReturns: true,
+					ExcludeReason: map[string]utils.ExcludedLabel{
+						"": {
+							Reason:   "Calling `vector()` will return a vector value with no labels.",
+							Fragment: `vector(scalar(foo))`,
+						},
+					},
+					Call: &promParser.Call{
+						Func: &promParser.Function{
+							Name: "vector",
+							ArgTypes: []promParser.ValueType{
+								promParser.ValueTypeScalar,
+							},
+							Variadic:   0,
+							ReturnType: promParser.ValueTypeVector,
+						},
+						Args: promParser.Expressions{
+							&promParser.Call{
+								Func: &promParser.Function{
+									Name: "scalar",
+									ArgTypes: []promParser.ValueType{
+										promParser.ValueTypeVector,
+									},
+									Variadic:   0,
+									ReturnType: promParser.ValueTypeScalar,
+								},
+								Args: promParser.Expressions{
+									mustParseVector("foo", 14),
+								},
+								PosRange: posrange.PositionRange{
+									Start: 7,
+									End:   18,
+								},
+							},
+						},
+						PosRange: posrange.PositionRange{
+							Start: 0,
+							End:   19,
+						},
+					},
+				},
+			},
+		},
+		{
+			expr: "vector(0.0  >= bool 0.5) == 1",
+			output: []utils.Source{
+				{
+					Type:          utils.FuncSource,
+					Returns:       promParser.ValueTypeVector,
+					Operation:     "vector",
+					FixedLabels:   true,
+					AlwaysReturns: true,
+					ExcludeReason: map[string]utils.ExcludedLabel{
+						"": {
+							Reason:   "Calling `vector()` will return a vector value with no labels.",
+							Fragment: `vector(0.0  >= bool 0.5)`,
+						},
+					},
+					Call: &promParser.Call{
+						Func: &promParser.Function{
+							Name: "vector",
+							ArgTypes: []promParser.ValueType{
+								promParser.ValueTypeScalar,
+							},
+							Variadic:   0,
+							ReturnType: promParser.ValueTypeVector,
+						},
+						Args: promParser.Expressions{
+							&promParser.BinaryExpr{
+								Op: promParser.GTE,
+								LHS: &promParser.NumberLiteral{
+									Val: 0,
+									PosRange: posrange.PositionRange{
+										Start: 7,
+										End:   10,
+									},
+								},
+								RHS: &promParser.NumberLiteral{
+									Val: 0.5,
+									PosRange: posrange.PositionRange{
+										Start: 20,
+										End:   23,
+									},
+								},
+								ReturnBool: true,
+							},
+						},
+						PosRange: posrange.PositionRange{
+							Start: 0,
+							End:   24,
+						},
+					},
+				},
+			},
+		},
 		{
 			expr: `sum_over_time(foo{job="myjob"}[5m])`,
 			output: []utils.Source{