diff --git a/python/src/com/jetbrains/python/codeInsight/intentions/PyStringConcatenationToFormatIntention.java b/python/src/com/jetbrains/python/codeInsight/intentions/PyStringConcatenationToFormatIntention.java
index 249e776f8bd6..42b79a66560c 100644
--- a/python/src/com/jetbrains/python/codeInsight/intentions/PyStringConcatenationToFormatIntention.java
+++ b/python/src/com/jetbrains/python/codeInsight/intentions/PyStringConcatenationToFormatIntention.java
@@ -15,8 +15,7 @@ import com.jetbrains.python.PyTokenTypes;
 import com.jetbrains.python.PythonStringUtil;
 import com.jetbrains.python.psi.*;
 import com.jetbrains.python.psi.impl.PyBuiltinCache;
-import com.jetbrains.python.psi.types.PyTypeChecker;
-import com.jetbrains.python.psi.types.TypeEvalContext;
+import com.jetbrains.python.psi.types.*;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
@@ -56,8 +55,9 @@ public class PyStringConcatenationToFormatIntention extends BaseIntentionAction
         return false;
       }
       final boolean isStringLiteral = expression instanceof PyStringLiteralExpression;
+      final PyType type = expression.getType(TypeEvalContext.slow());
       final boolean isStringReference = PyTypeChecker.match(cache.getStringType(LanguageLevel.forElement(expression)),
-                                                            expression.getType(TypeEvalContext.fast()), TypeEvalContext.fast());
+                                                            type, TypeEvalContext.slow()) && type != null;
       if (!(isStringLiteral  || ((expression instanceof PyReferenceExpression || expression instanceof PyCallExpression) &&
                                                            isStringReference))) {
         return false;
diff --git a/python/testData/intentions/afterStringConcatToFormat.py b/python/testData/intentions/afterStringConcatToFormat.py
index 4ed8d1c6b41d..66e2b1ff68ce 100644
--- a/python/testData/intentions/afterStringConcatToFormat.py
+++ b/python/testData/intentions/afterStringConcatToFormat.py
@@ -1 +1,4 @@
+def foo():
+  return "foo"
+c = "string"
 "a%sf_str%s" % (foo(), c)
\ No newline at end of file
diff --git a/python/testData/intentions/afterStringConcatToFormat1.py b/python/testData/intentions/afterStringConcatToFormat1.py
index e2618d480e2a..905a1680001a 100644
--- a/python/testData/intentions/afterStringConcatToFormat1.py
+++ b/python/testData/intentions/afterStringConcatToFormat1.py
@@ -1 +1,3 @@
+header = "header"
+value = "value"
 result += "%s : %s\n" % (header, value)
\ No newline at end of file
diff --git a/python/testData/intentions/afterUnicodeStringConcatToFormat.py b/python/testData/intentions/afterUnicodeStringConcatToFormat.py
index ffb33d38a03b..4e4897ebc584 100644
--- a/python/testData/intentions/afterUnicodeStringConcatToFormat.py
+++ b/python/testData/intentions/afterUnicodeStringConcatToFormat.py
@@ -1 +1,4 @@
+def foo():
+  return "foo"
+
 u'a%sf' % foo()
\ No newline at end of file
diff --git a/python/testData/intentions/beforeStringConcatToFormat.py b/python/testData/intentions/beforeStringConcatToFormat.py
index dcbdcd8e28e8..bc0102979c18 100644
--- a/python/testData/intentions/beforeStringConcatToFormat.py
+++ b/python/testData/intentions/beforeStringConcatToFormat.py
@@ -1 +1,4 @@
+def foo():
+  return "foo"
+c = "string"
 "a" + foo() <caret>+ "f" + "_str" + c
\ No newline at end of file
diff --git a/python/testData/intentions/beforeStringConcatToFormat1.py b/python/testData/intentions/beforeStringConcatToFormat1.py
index d978be40173a..080e87d38703 100644
--- a/python/testData/intentions/beforeStringConcatToFormat1.py
+++ b/python/testData/intentions/beforeStringConcatToFormat1.py
@@ -1 +1,3 @@
+header = "header"
+value = "value"
 result += header<caret> + " : " + value + "\n"
\ No newline at end of file
diff --git a/python/testData/intentions/beforeStringConcatToFormat4.py b/python/testData/intentions/beforeStringConcatToFormat4.py
new file mode 100644
index 000000000000..d5f91faf3162
--- /dev/null
+++ b/python/testData/intentions/beforeStringConcatToFormat4.py
@@ -0,0 +1,3 @@
+def foo3(x, y, z):
+  i = x + <caret>y + z
+  return i
\ No newline at end of file
diff --git a/python/testData/intentions/beforeUnicodeStringConcatToFormat.py b/python/testData/intentions/beforeUnicodeStringConcatToFormat.py
index 581ccc7e9e18..1eaa9dd28950 100644
--- a/python/testData/intentions/beforeUnicodeStringConcatToFormat.py
+++ b/python/testData/intentions/beforeUnicodeStringConcatToFormat.py
@@ -1 +1,4 @@
+def foo():
+  return "foo"
+
 u'a' + foo() <caret>+ u'f'
\ No newline at end of file
diff --git a/python/testSrc/com/jetbrains/python/PyIntentionTest.java b/python/testSrc/com/jetbrains/python/PyIntentionTest.java
index 7b92102469b9..9ad75e13bf23 100644
--- a/python/testSrc/com/jetbrains/python/PyIntentionTest.java
+++ b/python/testSrc/com/jetbrains/python/PyIntentionTest.java
@@ -125,6 +125,10 @@ public class PyIntentionTest extends PyTestCase {
     doTest(PyBundle.message("INTN.replace.plus.with.format.operator"));
   }
 
+  public void testStringConcatToFormat4() {   //PY-7968
+    doNegativeTest(PyBundle.message("INTN.replace.plus.with.format.operator"));
+  }
+
   public void testConvertFormatOperatorToMethod() {
     doTest(PyBundle.message("INTN.replace.with.method"), LanguageLevel.PYTHON26);
   }