After upgrade to 0.8.6i,graph export wrong

[cnlg]

I used to use cacti 0.8.6h and create a graph template to show traffic_in,traffic_out,unicast_in,unicast_out in one graph.But after upgrade to 0.8.6i,the graph export become wrong, debug information like below:

/usr/local/rrdtool-1.2.11/bin/rrdtool graph - \
--imgformat=PNG \
--start=-86400 \
--end=-300 \
--title="LY_XG_R_001 - 比特和数据包流量 - Gi3/0 - ly-xg-r-001(G3/0)_to_ly-xg-7301-rr(G0/0):1GE:1" \
--base=1000 \
--height=150 \
--width=500 \
--alt-autoscale-max \
--lower-limit=0 \
--vertical-label="Powered By : Chen Long" \
--slope-mode \
DEF:a="/usr/local/apache/htdocs/cacti-0.8.6i/rra/ly_xg_r_001_unicast_in_10617.rrd":unicast_out:AVERAGE \
DEF:b="/usr/local/apache/htdocs/cacti-0.8.6i/rra/ly_xg_r_001_unicast_in_10616.rrd":traffic_in:AVERAGE \
DEF:c="/usr/local/apache/htdocs/cacti-0.8.6i/rra/ly_xg_r_001_unicast_in_10616.rrd":traffic_out:AVERAGE \
DEF:d="/usr/local/apache/htdocs/cacti-0.8.6i/rra/ly_xg_r_001_unicast_in_10616.rrd":unicast_in:AVERAGE \
DEF:e="/usr/local/apache/htdocs/cacti-0.8.6i/rra/ly_xg_r_001_unicast_in_10616.rrd":unicast_out:AVERAGE \
CDEF:cdefb=b,8,* \
CDEF:cdefd=b,1000000,/,1000,/,100,*,8,* \
CDEF:cdefi=c,8,* \
CDEF:cdefba=c,1000000,/,1000,/,100,*,8,* \
CDEF:cdefbg=d,-1,*,1,* \
CDEF:cdefca=e,-1,*,1,* \
COMMENT:"Bits Traffic \:\n" \

There add one more line:

DEF:a="/usr/local/apache/htdocs/cacti-0.8.6i/rra/ly_xg_r_001_unicast_in_10617.rrd":unicast_out:AVERAGE

the file ly_xg_r_001_unicast_in_10617.rrd does not exist.
But with 0.8.6h this graph template is good,any one meet this question?what shall i do?
Sorry for my poor english.

[TheWitness]

The principal developer made a change to improve RRDtool command length. This resulted in 1) more efficient use of RRDtool resources 2) some broken templates.

Your data is not damaged.

TheWitness

[cnlg]

This Problem has resolved, because the graph template is wrong, chage a comment's data source to none is ok.
thanks TheWitness and everyone.