diff --git a/clang/lib/Analysis/UnsafeBufferUsage.cpp b/clang/lib/Analysis/UnsafeBufferUsage.cpp
--- a/clang/lib/Analysis/UnsafeBufferUsage.cpp
+++ b/clang/lib/Analysis/UnsafeBufferUsage.cpp
@@ -1885,9 +1885,12 @@
       const ParmVarDecl *Parm = FD->getParamDecl(i);
 
       if (Parm->isImplicit())
-        continue;
-      assert(Parm->getIdentifier() &&
-             "A parameter of a function definition has no name");
+        continue;      
+      // FIXME: If a parameter has no name, it is unused in the
+      // definition. So we could just leave it as it is.
+      if (!Parm->getIdentifier()) 
+	// If a parameter of a function definition has no name:
+        return std::nullopt;
       if (i == ParmIdx)
         // This is our spanified paramter!
         SS << NewTypeText.str() << "(" << Parm->getIdentifier()->getName().str() << ", "
diff --git a/clang/test/SemaCXX/warn-unsafe-buffer-usage-fixits-parm-span.cpp b/clang/test/SemaCXX/warn-unsafe-buffer-usage-fixits-parm-span.cpp
--- a/clang/test/SemaCXX/warn-unsafe-buffer-usage-fixits-parm-span.cpp
+++ b/clang/test/SemaCXX/warn-unsafe-buffer-usage-fixits-parm-span.cpp
@@ -156,4 +156,9 @@
   if (++MyName){}
 }
 
+// CHECK-NOT: fix-it:{{.*}}:
+void parmHasNoName(int *p, int *) { // cannot fix the function because there is one parameter has no name.
+  p[5] = 5;
+}
+
 #endif