diff --git a/data/NX simulation output.uff b/data/NX simulation output.uff
index b99bcc4..49eb920 100644
--- a/data/NX simulation output.uff	
+++ b/data/NX simulation output.uff	
@@ -16,7 +16,7 @@ NX: Correlation
     -1
     -1
   2400
-          13     7    +1           0
+          13     7    -1           0
 Fem1                                                                            
                                                                                 
  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
diff --git a/pyuff/pyuff.py b/pyuff/pyuff.py
index 939f4f5..7946640 100644
--- a/pyuff/pyuff.py
+++ b/pyuff/pyuff.py
@@ -186,7 +186,16 @@ def refresh(self):
                     ind = data.find(b'    -1', ind + 1)
                     if ind == -1:
                         break
-                    block_ind.append(ind)
+                    if ind+6 == data_len:
+                        block_ind.append(ind)
+                    # Check if the block is valid and ends with LF or CR
+                    elif ind+6 < data_len and data[ind+6] in [10, 13]:
+                        block_ind.append(ind)
+                    # Check the line continues with blanks up to character 80
+                    elif ind+80 < data_len and data[ind+6:ind+80] == \
+                        b'                                                                          ':
+                        block_ind.append(ind)
+                    
                 block_ind = np.asarray(block_ind, dtype='int64')
 
                 # Constructs block indices of start and end values; each pair
diff --git a/tests/test_58.py b/tests/test_58.py
index 2370cc3..53dbe39 100644
--- a/tests/test_58.py
+++ b/tests/test_58.py
@@ -288,8 +288,7 @@ def test_write_read_func_type_0():
 
 
 if __name__ == '__main__':
-    test_read_write_read_given_data()
-    test_write_read_func_type_0()
+    test_fix_58b()
 
 if __name__ == '__mains__':
     np.testing.run_module_suite()
\ No newline at end of file