diff --git a/tools/tiff2ps.c b/tools/tiff2ps.c
index 82a5d84..3563f30 100644
--- a/tools/tiff2ps.c
+++ b/tools/tiff2ps.c
@@ -2964,7 +2964,9 @@ tsize_t Ascii85EncodeBlock( uint8 * ascii85_p, unsigned f_eod, const uint8 * raw
     
             if ( val32 == 0 )                   /* Special case */
             {
-                ascii85_p[ascii85_l] = 'z';
+                if(ascii85_p != NULL) {
+                    ascii85_p[ascii85_l] = 'z';
+                }
                 rc = 1;
             }
     
diff --git a/tools/tiffcrop.c b/tools/tiffcrop.c
index 722b132..d879788 100644
--- a/tools/tiffcrop.c
+++ b/tools/tiffcrop.c
@@ -2810,7 +2810,6 @@ extractContigSamples8bits (uint8 *in, uint8 *out, uint32 cols,
   
   ready_bits = 0;
   maskbits =  (uint8)-1 >> ( 8 - bps);
-  buff1 = buff2 = 0;
   for (col = start; col < end; col++)
     {    /* Compute src byte(s) and bits within byte(s) */
     bit_offset = col * bps * spp;