Billing graphs (Accurate,historical,transfer) use incorrect to value as default

The graphs on the Billing portion fail to render, due to pulling incorrect information. Attempting to load the 'Accurate graph' for example, the img url reports an internal server 500 error due to resource not found.

I tried to load the file/image directly, with debug, and the SQL statement is showing an incorrect <= FROM_UNIXTIMESTAMP value. The value is that of 1414817999 which converts to Jun 26th 1974. There are obviously, no records in mysql earlier than Jun 26th 1974.

The full debug page from trying to load the image is as follows:

> $vars
/opt/observium/includes/common.inc.php:193SELECT * FROM `entity_permissions` WHERE `user_id` = '1'
string(56)
/opt/observium/includes/common.inc.php:193SELECT `value` FROM `users_prefs` WHERE `user_id` = '1' AND `pref` = 'atom_key'
string(79)
/opt/observium/includes/common.inc.php:193SELECT * from `bills` WHERE `bill_id`= '1' LIMIT 1
string(50)
/opt/observium/includes/common.inc.php:193SELECT count(`delta`) FROM `bill_data` WHERE `bill_id` = '1' AND `timestamp` >= FROM_UNIXTIME( '1412139600' ) AND `timestamp` <= FROM_UNIXTIME( '1414817999' )
string(158)
/opt/observium/includes/common.inc.php:193SELECT *, UNIX_TIMESTAMP(timestamp) AS formatted_date FROM bill_data WHERE bill_id = '1' AND `timestamp` >= FROM_UNIXTIME( '1412139600' ) AND `timestamp` <= FROM_UNIXTIME( '1414817999' ) ORDER BY timestamp ASC
string(209)
JpGraph Error: 25082 Illegal sizes specified for width or height when creating an image, (width=0, height=0)

When using the statement SELECT *, UNIX_TIMESTAMP(timestamp) AS formatted_date FROM bill_data WHERE bill_id = '1' AND `timestamp` >= FROM_UNIXTIME( '1412139600' ) AND `timestamp` <= FROM_UNIXTIME( '1414817999' ) ORDER BY timestamp ASC` in mysql cli, 0 rows are returned.

Changing the last `FROM_UNIXTIMESTAMP` to the current unix timestamp (ex, using date+%s which returns 1412275323), the SQL statement returns 50 rows.

Changing the URL above, to reflect the new 1412275323 value, the graph image still fails to render. The only difference in the output from above, is the new value reflected in the SQL statement.