diff --git a/mapstest/assertion_messages_test.go b/mapstest/assertion_messages_test.go
index ccf57a1..8b91cf0 100644
--- a/mapstest/assertion_messages_test.go
+++ b/mapstest/assertion_messages_test.go
@@ -17,7 +17,7 @@ func TestAssertContains_message(t *testing.T) {
 
 	require.False(t, b)
 	assert.Equal(t, `
-	Error Trace:	assertions.go:51
+	Error Trace:	assertions.go:54
 	            				assertion_messages_test.go:16
 	Error:      	v1 does not contain v2: 
 	            	values are not equal
@@ -42,7 +42,7 @@ func TestAssertNotContains_message(t *testing.T) {
 
 	require.False(t, b)
 	assert.Equal(t, `
-	Error Trace:	assertions.go:75
+	Error Trace:	assertions.go:81
 	            				assertion_messages_test.go:41
 	Error:      	v1 should not contain v2: 
 	            	v1: red
@@ -58,7 +58,7 @@ func TestAssertEquivalent_message(t *testing.T) {
 
 	require.False(t, b)
 	assert.Equal(t, `
-	Error Trace:	assertions.go:111
+	Error Trace:	assertions.go:120
 	            				assertion_messages_test.go:57
 	Error:      	v1 !≈ v2: 
 	            	values are not equal
@@ -83,7 +83,7 @@ func TestAssertNotEquivalent_message(t *testing.T) {
 
 	require.False(t, b)
 	assert.Equal(t, `
-	Error Trace:	assertions.go:135
+	Error Trace:	assertions.go:147
 	            				assertion_messages_test.go:82
 	Error:      	v1 should not ≈ v2: 
 	            	v1: red
diff --git a/mapstest/assertions.go b/mapstest/assertions.go
index 4fe2c62..d35afef 100644
--- a/mapstest/assertions.go
+++ b/mapstest/assertions.go
@@ -37,6 +37,9 @@ func AssertContains(t TestingT, v1, v2 interface{}, optsMsgAndArgs ...interface{
 	}
 	opts, optsMsgAndArgs := splitOptions(optsMsgAndArgs)
 	match := maps.ContainsMatch(v1, v2, opts...)
+	if !assert.NoError(t, match.Error, match.Message) {
+		return false
+	}
 
 	if !match.Matches {
 		nv1, err := maps.Normalize(v1)
@@ -44,7 +47,7 @@ func AssertContains(t TestingT, v1, v2 interface{}, optsMsgAndArgs ...interface{
 			v1 = nv1
 		}
 		nv2, err := maps.Normalize(v2)
-		if !assert.NoError(t, err, "error normalizing v2") {
+		if assert.NoError(t, err, "error normalizing v2") {
 			v2 = nv2
 		}
 		diff := containsDiff(v1, v2)
@@ -62,6 +65,9 @@ func AssertNotContains(t TestingT, v1, v2 interface{}, optsMsgAndArgs ...interfa
 	}
 	opts, optsMsgAndArgs := splitOptions(optsMsgAndArgs)
 	match := maps.ContainsMatch(v1, v2, opts...)
+	if !assert.NoError(t, match.Error, match.Message) {
+		return false
+	}
 
 	if match.Matches {
 		nv1, err := maps.Normalize(v1)
@@ -98,6 +104,9 @@ func AssertEquivalent(t TestingT, v1, v2 interface{}, optsMsgAndArgs ...interfac
 	}
 	opts, optsMsgAndArgs := splitOptions(optsMsgAndArgs)
 	match := maps.EquivalentMatch(v1, v2, opts...)
+	if !assert.NoError(t, match.Error, match.Message) {
+		return false
+	}
 
 	if !match.Matches {
 		nv1, err := maps.Normalize(v1)
@@ -122,6 +131,9 @@ func AssertNotEquivalent(t TestingT, v1, v2 interface{}, optsMsgAndArgs ...inter
 	}
 	opts, optsMsgAndArgs := splitOptions(optsMsgAndArgs)
 	match := maps.EquivalentMatch(v1, v2, opts...)
+	if !assert.NoError(t, match.Error, match.Message) {
+		return false
+	}
 
 	if match.Matches {
 		nv1, err := maps.Normalize(v1)
diff --git a/mapstest/assertions_test.go b/mapstest/assertions_test.go
index 26392f6..3d0b1e7 100644
--- a/mapstest/assertions_test.go
+++ b/mapstest/assertions_test.go
@@ -34,6 +34,7 @@ func TestAssertionsContains(t *testing.T) {
 		v1, v2   interface{}
 		contains bool
 		equiv    bool
+		err      bool
 		opts     []interface{}
 	}{
 		{
@@ -74,6 +75,11 @@ func TestAssertionsContains(t *testing.T) {
 			contains: true,
 			equiv:    false,
 		},
+		{
+			v1:  "string",
+			v2:  make(chan bool),
+			err: true,
+		},
 	}
 
 	for _, test := range tests {
@@ -87,6 +93,7 @@ func TestAssertionsContains(t *testing.T) {
 			af := func(fn assertFunc, expectSuccess bool) {
 				mt := mockTestingT{}
 				b := fn(&mt, test.v1, test.v2, test.opts...)
+				t.Logf("msg: " + mt.msg)
 				assert.Equal(t, expectSuccess, b)
 				if expectSuccess {
 					assert.False(t, mt.failed)
@@ -100,6 +107,7 @@ func TestAssertionsContains(t *testing.T) {
 			rf := func(fn requireFunc, expectSuccess bool) {
 				mt := mockTestingT{}
 				fn(&mt, test.v1, test.v2, test.opts...)
+				t.Logf("msg: " + mt.msg)
 				if expectSuccess {
 					assert.False(t, mt.failed)
 					assert.False(t, mt.failedNow)
@@ -109,15 +117,15 @@ func TestAssertionsContains(t *testing.T) {
 				}
 			}
 
-			af(AssertContains, test.contains)
-			af(AssertNotContains, !test.contains)
-			rf(RequireContains, test.contains)
-			rf(RequireNotContains, !test.contains)
+			af(AssertContains, test.contains && !test.err)
+			af(AssertNotContains, !test.contains && !test.err)
+			rf(RequireContains, test.contains && !test.err)
+			rf(RequireNotContains, !test.contains && !test.err)
 
-			af(AssertEquivalent, test.equiv)
-			af(AssertNotEquivalent, !test.equiv)
-			rf(RequireEquivalent, test.equiv)
-			rf(RequireNotEquivalent, !test.equiv)
+			af(AssertEquivalent, test.equiv && !test.err)
+			af(AssertNotEquivalent, !test.equiv && !test.err)
+			rf(RequireEquivalent, test.equiv && !test.err)
+			rf(RequireNotEquivalent, !test.equiv && !test.err)
 
 		})
 	}