diff --git a/gcc/fortran/expr.cc b/gcc/fortran/expr.cc
index be94c18c836..290ddf360c8 100644
--- a/gcc/fortran/expr.cc
+++ b/gcc/fortran/expr.cc
@@ -2287,7 +2287,8 @@ gfc_simplify_expr (gfc_expr *p, int type)
 	 initialization expression, or we want a subsection.  */
       if (p->symtree->n.sym->attr.flavor == FL_PARAMETER
 	  && (gfc_init_expr_flag || p->ref
-	      || p->symtree->n.sym->value->expr_type != EXPR_ARRAY))
+	      || (p->symtree->n.sym->value
+		  && p->symtree->n.sym->value->expr_type != EXPR_ARRAY)))
 	{
 	  if (!simplify_parameter_variable (p, type))
 	    return false;
diff --git a/gcc/testsuite/gfortran.dg/pr106985.f90 b/gcc/testsuite/gfortran.dg/pr106985.f90
new file mode 100644
index 00000000000..f4ed92577a3
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr106985.f90
@@ -0,0 +1,8 @@
+! { dg-do compile }
+! PR fortran/106985 - ICE in gfc_simplify_expr
+! Contributed by G.Steinmetz
+
+program p
+  integer, parameter :: a(2) = 1
+  integer, parameter :: b = a(2) + b ! { dg-error "before its definition is complete" }
+end